diff --git a/drivers/gles3/storage/particles_storage.cpp b/drivers/gles3/storage/particles_storage.cpp
index 0a6f02511cd..4e6b844e932 100644
--- a/drivers/gles3/storage/particles_storage.cpp
+++ b/drivers/gles3/storage/particles_storage.cpp
@@ -775,7 +775,7 @@ void ParticlesStorage::particles_set_view_axis(RID p_particles, const Vector3 &p
 		LocalVector<ParticleInstanceData3D> particle_vector;
 		particle_vector.resize(particles->amount);
 		particle_array = particle_vector.ptr();
-		glGetBufferSubData(GL_ARRAY_BUFFER, 0, particles->amount * sizeof(ParticleInstanceData3D), particle_array);
+		godot_webgl2_glGetBufferSubData(GL_ARRAY_BUFFER, 0, particles->amount * sizeof(ParticleInstanceData3D), particle_array);
 #endif
 		SortArray<ParticleInstanceData3D, ParticlesViewSort> sorter;
 		sorter.compare.z_dir = axis;
@@ -1133,7 +1133,7 @@ void ParticlesStorage::_particles_reverse_lifetime_sort(Particles *particles) {
 	LocalVector<ParticleInstanceData> particle_vector;
 	particle_vector.resize(particles->amount);
 	particle_array = particle_vector.ptr();
-	glGetBufferSubData(GL_ARRAY_BUFFER, 0, buffer_size, particle_array);
+	godot_webgl2_glGetBufferSubData(GL_ARRAY_BUFFER, 0, buffer_size, particle_array);
 #endif
 
 	uint32_t lifetime_split = (MIN(int(particles->amount * particles->sort_buffer_phase), particles->amount - 1) + 1) % particles->amount;
diff --git a/drivers/gles3/storage/utilities.cpp b/drivers/gles3/storage/utilities.cpp
index 07df445018c..7deeefc37d9 100644
--- a/drivers/gles3/storage/utilities.cpp
+++ b/drivers/gles3/storage/utilities.cpp
@@ -115,7 +115,7 @@ Vector<uint8_t> Utilities::buffer_get_data(GLenum p_target, GLuint p_buffer, uin
 #if defined(__EMSCRIPTEN__)
 	{
 		uint8_t *w = ret.ptrw();
-		glGetBufferSubData(p_target, 0, p_buffer_size, w);
+		godot_webgl2_glGetBufferSubData(p_target, 0, p_buffer_size, w);
 	}
 #else
 	void *data = glMapBufferRange(p_target, 0, p_buffer_size, GL_MAP_READ_BIT);
diff --git a/modules/webrtc/library_godot_webrtc.js b/modules/webrtc/library_godot_webrtc.js
index 7ece4aa8723..eae41207415 100644
--- a/modules/webrtc/library_godot_webrtc.js
+++ b/modules/webrtc/library_godot_webrtc.js
@@ -90,6 +90,7 @@ const GodotRTCDataChannel = {
 		},
 	},
 
+	godot_js_rtc_datachannel_ready_state_get__proxy: 'sync',
 	godot_js_rtc_datachannel_ready_state_get__sig: 'ii',
 	godot_js_rtc_datachannel_ready_state_get: function (p_id) {
 		const ref = IDHandler.get(p_id);
@@ -110,6 +111,7 @@ const GodotRTCDataChannel = {
 		}
 	},
 
+	godot_js_rtc_datachannel_send__proxy: 'sync',
 	godot_js_rtc_datachannel_send__sig: 'iiiii',
 	godot_js_rtc_datachannel_send: function (p_id, p_buffer, p_length, p_raw) {
 		const ref = IDHandler.get(p_id);
@@ -131,16 +133,19 @@ const GodotRTCDataChannel = {
 		return 0;
 	},
 
+	godot_js_rtc_datachannel_is_ordered__proxy: 'sync',
 	godot_js_rtc_datachannel_is_ordered__sig: 'ii',
 	godot_js_rtc_datachannel_is_ordered: function (p_id) {
 		return GodotRTCDataChannel.get_prop(p_id, 'ordered', true);
 	},
 
+	godot_js_rtc_datachannel_id_get__proxy: 'sync',
 	godot_js_rtc_datachannel_id_get__sig: 'ii',
 	godot_js_rtc_datachannel_id_get: function (p_id) {
 		return GodotRTCDataChannel.get_prop(p_id, 'id', 65535);
 	},
 
+	godot_js_rtc_datachannel_max_packet_lifetime_get__proxy: 'sync',
 	godot_js_rtc_datachannel_max_packet_lifetime_get__sig: 'ii',
 	godot_js_rtc_datachannel_max_packet_lifetime_get: function (p_id) {
 		const ref = IDHandler.get(p_id);
@@ -156,21 +161,25 @@ const GodotRTCDataChannel = {
 		return 65535;
 	},
 
+	godot_js_rtc_datachannel_max_retransmits_get__proxy: 'sync',
 	godot_js_rtc_datachannel_max_retransmits_get__sig: 'ii',
 	godot_js_rtc_datachannel_max_retransmits_get: function (p_id) {
 		return GodotRTCDataChannel.get_prop(p_id, 'maxRetransmits', 65535);
 	},
 
+	godot_js_rtc_datachannel_is_negotiated__proxy: 'sync',
 	godot_js_rtc_datachannel_is_negotiated__sig: 'ii',
 	godot_js_rtc_datachannel_is_negotiated: function (p_id) {
 		return GodotRTCDataChannel.get_prop(p_id, 'negotiated', 65535);
 	},
 
+	godot_js_rtc_datachannel_get_buffered_amount__proxy: 'sync',
 	godot_js_rtc_datachannel_get_buffered_amount__sig: 'ii',
 	godot_js_rtc_datachannel_get_buffered_amount: function (p_id) {
 		return GodotRTCDataChannel.get_prop(p_id, 'bufferedAmount', 0);
 	},
 
+	godot_js_rtc_datachannel_label_get__proxy: 'sync',
 	godot_js_rtc_datachannel_label_get__sig: 'ii',
 	godot_js_rtc_datachannel_label_get: function (p_id) {
 		const ref = IDHandler.get(p_id);
@@ -189,12 +198,14 @@ const GodotRTCDataChannel = {
 		return GodotRuntime.allocString(ref.protocol);
 	},
 
+	godot_js_rtc_datachannel_destroy__proxy: 'sync',
 	godot_js_rtc_datachannel_destroy__sig: 'vi',
 	godot_js_rtc_datachannel_destroy: function (p_id) {
 		GodotRTCDataChannel.close(p_id);
 		IDHandler.remove(p_id);
 	},
 
+	godot_js_rtc_datachannel_connect__proxy: 'sync',
 	godot_js_rtc_datachannel_connect__sig: 'viiiiii',
 	godot_js_rtc_datachannel_connect: function (p_id, p_ref, p_on_open, p_on_message, p_on_error, p_on_close) {
 		const onopen = GodotRuntime.get_func(p_on_open).bind(null, p_ref);
@@ -204,6 +215,7 @@ const GodotRTCDataChannel = {
 		GodotRTCDataChannel.connect(p_id, onopen, onmessage, onerror, onclose);
 	},
 
+	godot_js_rtc_datachannel_close__proxy: 'sync',
 	godot_js_rtc_datachannel_close__sig: 'vi',
 	godot_js_rtc_datachannel_close: function (p_id) {
 		const ref = IDHandler.get(p_id);
@@ -356,6 +368,7 @@ const GodotRTCPeerConnection = {
 		},
 	},
 
+	godot_js_rtc_pc_create__proxy: 'sync',
 	godot_js_rtc_pc_create__sig: 'iiiiiiii',
 	godot_js_rtc_pc_create: function (p_config, p_ref, p_on_connection_state_change, p_on_ice_gathering_state_change, p_on_signaling_state_change, p_on_ice_candidate, p_on_datachannel) {
 		const wrap = function (p_func) {
@@ -371,6 +384,7 @@ const GodotRTCPeerConnection = {
 		);
 	},
 
+	godot_js_rtc_pc_close__proxy: 'sync',
 	godot_js_rtc_pc_close__sig: 'vi',
 	godot_js_rtc_pc_close: function (p_id) {
 		const ref = IDHandler.get(p_id);
@@ -380,11 +394,13 @@ const GodotRTCPeerConnection = {
 		ref.close();
 	},
 
+	godot_js_rtc_pc_destroy__proxy: 'sync',
 	godot_js_rtc_pc_destroy__sig: 'vi',
 	godot_js_rtc_pc_destroy: function (p_id) {
 		GodotRTCPeerConnection.destroy(p_id);
 	},
 
+	godot_js_rtc_pc_offer_create__proxy: 'sync',
 	godot_js_rtc_pc_offer_create__sig: 'viiii',
 	godot_js_rtc_pc_offer_create: function (p_id, p_obj, p_on_session, p_on_error) {
 		const ref = IDHandler.get(p_id);
@@ -400,6 +416,7 @@ const GodotRTCPeerConnection = {
 		});
 	},
 
+	godot_js_rtc_pc_local_description_set__proxy: 'sync',
 	godot_js_rtc_pc_local_description_set__sig: 'viiiii',
 	godot_js_rtc_pc_local_description_set: function (p_id, p_type, p_sdp, p_obj, p_on_error) {
 		const ref = IDHandler.get(p_id);
@@ -417,6 +434,7 @@ const GodotRTCPeerConnection = {
 		});
 	},
 
+	godot_js_rtc_pc_remote_description_set__proxy: 'sync',
 	godot_js_rtc_pc_remote_description_set__sig: 'viiiiii',
 	godot_js_rtc_pc_remote_description_set: function (p_id, p_type, p_sdp, p_obj, p_session_created, p_on_error) {
 		const ref = IDHandler.get(p_id);
@@ -442,6 +460,7 @@ const GodotRTCPeerConnection = {
 		});
 	},
 
+	godot_js_rtc_pc_ice_candidate_add__proxy: 'sync',
 	godot_js_rtc_pc_ice_candidate_add__sig: 'viiii',
 	godot_js_rtc_pc_ice_candidate_add: function (p_id, p_mid_name, p_mline_idx, p_sdp) {
 		const ref = IDHandler.get(p_id);
@@ -458,6 +477,7 @@ const GodotRTCPeerConnection = {
 	},
 
 	godot_js_rtc_pc_datachannel_create__deps: ['$GodotRTCDataChannel'],
+	godot_js_rtc_pc_datachannel_create__proxy: 'sync',
 	godot_js_rtc_pc_datachannel_create__sig: 'iiii',
 	godot_js_rtc_pc_datachannel_create: function (p_id, p_label, p_config) {
 		try {
diff --git a/modules/websocket/library_godot_websocket.js b/modules/websocket/library_godot_websocket.js
index ed01c69725b..5e0c6fc5761 100644
--- a/modules/websocket/library_godot_websocket.js
+++ b/modules/websocket/library_godot_websocket.js
@@ -144,6 +144,7 @@ const GodotWebSocket = {
 		},
 	},
 
+	godot_js_websocket_create__proxy: 'sync',
 	godot_js_websocket_create__sig: 'iiiiiiii',
 	godot_js_websocket_create: function (p_ref, p_url, p_proto, p_on_open, p_on_message, p_on_error, p_on_close) {
 		const on_open = GodotRuntime.get_func(p_on_open).bind(null, p_ref);
@@ -166,6 +167,7 @@ const GodotWebSocket = {
 		return GodotWebSocket.create(socket, on_open, on_message, on_error, on_close);
 	},
 
+	godot_js_websocket_send__proxy: 'sync',
 	godot_js_websocket_send__sig: 'iiiii',
 	godot_js_websocket_send: function (p_id, p_buf, p_buf_len, p_raw) {
 		const bytes_array = new Uint8Array(p_buf_len);
@@ -180,11 +182,13 @@ const GodotWebSocket = {
 		return GodotWebSocket.send(p_id, out);
 	},
 
+	godot_js_websocket_buffered_amount__proxy: 'sync',
 	godot_js_websocket_buffered_amount__sig: 'ii',
 	godot_js_websocket_buffered_amount: function (p_id) {
 		return GodotWebSocket.bufferedAmount(p_id);
 	},
 
+	godot_js_websocket_close__proxy: 'sync',
 	godot_js_websocket_close__sig: 'viii',
 	godot_js_websocket_close: function (p_id, p_code, p_reason) {
 		const code = p_code;
@@ -192,6 +196,7 @@ const GodotWebSocket = {
 		GodotWebSocket.close(p_id, code, reason);
 	},
 
+	godot_js_websocket_destroy__proxy: 'sync',
 	godot_js_websocket_destroy__sig: 'vi',
 	godot_js_websocket_destroy: function (p_id) {
 		GodotWebSocket.destroy(p_id);
diff --git a/platform/web/detect.py b/platform/web/detect.py
index 043ddca65da..d3068698890 100644
--- a/platform/web/detect.py
+++ b/platform/web/detect.py
@@ -41,6 +41,11 @@ def get_opts():
             "dlink_enabled", "Enable WebAssembly dynamic linking (GDExtension support). Produces bigger binaries", False
         ),
         BoolVariable("use_closure_compiler", "Use closure compiler to minimize JavaScript code", False),
+        BoolVariable(
+            "proxy_to_pthread",
+            "Use Emscripten PROXY_TO_PTHREAD option to run the main application code to a separate thread",
+            True,
+        ),
     ]
 
 
@@ -211,6 +216,10 @@ def configure(env: "Environment"):
             env.Append(LINKFLAGS=["-Wl,-u,scalbnf"])
 
     if env["dlink_enabled"]:
+        if env["proxy_to_pthread"]:
+            print("GDExtension support requires proxy_to_pthread=no, disabling")
+            env["proxy_to_pthread"] = False
+
         if cc_semver < (3, 1, 14):
             print("GDExtension support requires emscripten >= 3.1.14, detected: %s.%s.%s" % cc_semver)
             sys.exit(255)
@@ -221,6 +230,16 @@ def configure(env: "Environment"):
         env.Append(LINKFLAGS=["-fvisibility=hidden"])
         env.extra_suffix = ".dlink" + env.extra_suffix
 
+    # Run the main application in a web worker
+    if env["proxy_to_pthread"]:
+        env.Append(LINKFLAGS=["-s", "PROXY_TO_PTHREAD=1"])
+        env.Append(CPPDEFINES=["PROXY_TO_PTHREAD_ENABLED"])
+        env.Append(LINKFLAGS=["-s", "EXPORTED_RUNTIME_METHODS=['_emscripten_proxy_main']"])
+        # https://github.com/emscripten-core/emscripten/issues/18034#issuecomment-1277561925
+        env.Append(LINKFLAGS=["-s", "TEXTDECODER=0"])
+        # BigInt support to pass object pointers between contexts
+        env.Append(LINKFLAGS=["-s", "WASM_BIGINT"])
+
     # Reduce code size by generating less support code (e.g. skip NodeJS support).
     env.Append(LINKFLAGS=["-s", "ENVIRONMENT=web,worker"])
 
diff --git a/platform/web/display_server_web.cpp b/platform/web/display_server_web.cpp
index dcc4ac4bf74..022e044185c 100644
--- a/platform/web/display_server_web.cpp
+++ b/platform/web/display_server_web.cpp
@@ -35,6 +35,7 @@
 #include "os_web.h"
 
 #include "core/config/project_settings.h"
+#include "core/object/callable_method_pointer.h"
 #include "scene/resources/atlas_texture.h"
 #include "servers/rendering/dummy/rasterizer_dummy.h"
 
@@ -59,13 +60,26 @@ DisplayServerWeb *DisplayServerWeb::get_singleton() {
 bool DisplayServerWeb::check_size_force_redraw() {
 	bool size_changed = godot_js_display_size_update() != 0;
 	if (size_changed && !rect_changed_callback.is_null()) {
-		Variant size = Rect2i(Point2i(), window_get_size()); // TODO use window_get_position if implemented.
+		Size2i window_size = window_get_size();
+		Variant size = Rect2i(Point2i(), window_size); // TODO use window_get_position if implemented.
 		rect_changed_callback.call(size);
+		emscripten_set_canvas_element_size(canvas_id, window_size.x, window_size.y);
 	}
 	return size_changed;
 }
 
 void DisplayServerWeb::fullscreen_change_callback(int p_fullscreen) {
+#ifdef PROXY_TO_PTHREAD_ENABLED
+	if (!Thread::is_main_thread()) {
+		callable_mp_static(DisplayServerWeb::_fullscreen_change_callback).bind(p_fullscreen).call_deferred();
+		return;
+	}
+#endif
+
+	_fullscreen_change_callback(p_fullscreen);
+}
+
+void DisplayServerWeb::_fullscreen_change_callback(int p_fullscreen) {
 	DisplayServerWeb *display = get_singleton();
 	if (p_fullscreen) {
 		display->window_mode = WINDOW_MODE_FULLSCREEN;
@@ -75,7 +89,23 @@ void DisplayServerWeb::fullscreen_change_callback(int p_fullscreen) {
 }
 
 // Drag and drop callback.
-void DisplayServerWeb::drop_files_js_callback(char **p_filev, int p_filec) {
+void DisplayServerWeb::drop_files_js_callback(const char **p_filev, int p_filec) {
+	Vector<String> files;
+	for (int i = 0; i < p_filec; i++) {
+		files.push_back(String::utf8(p_filev[i]));
+	}
+
+#ifdef PROXY_TO_PTHREAD_ENABLED
+	if (!Thread::is_main_thread()) {
+		callable_mp_static(DisplayServerWeb::_drop_files_js_callback).bind(files).call_deferred();
+		return;
+	}
+#endif
+
+	_drop_files_js_callback(files);
+}
+
+void DisplayServerWeb::_drop_files_js_callback(const Vector<String> &p_files) {
 	DisplayServerWeb *ds = get_singleton();
 	if (!ds) {
 		ERR_FAIL_MSG("Unable to drop files because the DisplayServer is not active");
@@ -83,15 +113,22 @@ void DisplayServerWeb::drop_files_js_callback(char **p_filev, int p_filec) {
 	if (ds->drop_files_callback.is_null()) {
 		return;
 	}
-	Vector<String> files;
-	for (int i = 0; i < p_filec; i++) {
-		files.push_back(String::utf8(p_filev[i]));
-	}
-	ds->drop_files_callback.call(files);
+	ds->drop_files_callback.call(p_files);
 }
 
 // Web quit request callback.
 void DisplayServerWeb::request_quit_callback() {
+#ifdef PROXY_TO_PTHREAD_ENABLED
+	if (!Thread::is_main_thread()) {
+		callable_mp_static(DisplayServerWeb::_request_quit_callback).call_deferred();
+		return;
+	}
+#endif
+
+	_request_quit_callback();
+}
+
+void DisplayServerWeb::_request_quit_callback() {
 	DisplayServerWeb *ds = get_singleton();
 	if (ds && !ds->window_event_callback.is_null()) {
 		Variant event = int(DisplayServer::WINDOW_EVENT_CLOSE_REQUEST);
@@ -119,17 +156,32 @@ void DisplayServerWeb::dom2godot_mod(Ref<InputEventWithModifiers> ev, int p_mod,
 void DisplayServerWeb::key_callback(int p_pressed, int p_repeat, int p_modifiers) {
 	DisplayServerWeb *ds = get_singleton();
 	JSKeyEvent &key_event = ds->key_event;
+
+	const String code = String::utf8(key_event.code);
+	const String key = String::utf8(key_event.key);
+
+#ifdef PROXY_TO_PTHREAD_ENABLED
+	if (!Thread::is_main_thread()) {
+		callable_mp_static(DisplayServerWeb::_key_callback).bind(code, key, p_pressed, p_repeat, p_modifiers).call_deferred();
+		return;
+	}
+#endif
+
+	_key_callback(code, key, p_pressed, p_repeat, p_modifiers);
+}
+
+void DisplayServerWeb::_key_callback(const String &p_key_event_code, const String &p_key_event_key, int p_pressed, int p_repeat, int p_modifiers) {
 	// Resume audio context after input in case autoplay was denied.
 	OS_Web::get_singleton()->resume_audio();
 
 	char32_t c = 0x00;
-	String unicode = String::utf8(key_event.key);
+	String unicode = p_key_event_key;
 	if (unicode.length() == 1) {
 		c = unicode[0];
 	}
 
-	Key keycode = dom_code2godot_scancode(key_event.code, key_event.key, false);
-	Key scancode = dom_code2godot_scancode(key_event.code, key_event.key, true);
+	Key keycode = dom_code2godot_scancode(p_key_event_code.utf8().get_data(), p_key_event_key.utf8().get_data(), false);
+	Key scancode = dom_code2godot_scancode(p_key_event_code.utf8().get_data(), p_key_event_key.utf8().get_data(), true);
 
 	Ref<InputEventKey> ev;
 	ev.instantiate();
@@ -150,6 +202,17 @@ void DisplayServerWeb::key_callback(int p_pressed, int p_repeat, int p_modifiers
 // Mouse
 
 int DisplayServerWeb::mouse_button_callback(int p_pressed, int p_button, double p_x, double p_y, int p_modifiers) {
+#ifdef PROXY_TO_PTHREAD_ENABLED
+	if (!Thread::is_main_thread()) {
+		callable_mp_static(DisplayServerWeb::_mouse_button_callback).bind(p_pressed, p_button, p_x, p_y, p_modifiers).call_deferred();
+		return true;
+	}
+#endif
+
+	return _mouse_button_callback(p_pressed, p_button, p_x, p_y, p_modifiers);
+}
+
+int DisplayServerWeb::_mouse_button_callback(int p_pressed, int p_button, double p_x, double p_y, int p_modifiers) {
 	DisplayServerWeb *ds = get_singleton();
 
 	Point2 pos(p_x, p_y);
@@ -226,6 +289,17 @@ int DisplayServerWeb::mouse_button_callback(int p_pressed, int p_button, double
 }
 
 void DisplayServerWeb::mouse_move_callback(double p_x, double p_y, double p_rel_x, double p_rel_y, int p_modifiers) {
+#ifdef PROXY_TO_PTHREAD_ENABLED
+	if (!Thread::is_main_thread()) {
+		callable_mp_static(DisplayServerWeb::_mouse_move_callback).bind(p_x, p_y, p_rel_x, p_rel_y, p_modifiers).call_deferred();
+		return;
+	}
+#endif
+
+	_mouse_move_callback(p_x, p_y, p_rel_x, p_rel_y, p_modifiers);
+}
+
+void DisplayServerWeb::_mouse_move_callback(double p_x, double p_y, double p_rel_x, double p_rel_y, int p_modifiers) {
 	BitField<MouseButtonMask> input_mask = Input::get_singleton()->get_mouse_button_mask();
 	// For motion outside the canvas, only read mouse movement if dragging
 	// started inside the canvas; imitating desktop app behavior.
@@ -301,9 +375,25 @@ bool DisplayServerWeb::tts_is_paused() const {
 }
 
 void DisplayServerWeb::update_voices_callback(int p_size, const char **p_voice) {
-	get_singleton()->voices.clear();
+	Vector<String> voices;
 	for (int i = 0; i < p_size; i++) {
-		Vector<String> tokens = String::utf8(p_voice[i]).split(";", true, 2);
+		voices.append(String::utf8(p_voice[i]));
+	}
+
+#ifdef PROXY_TO_PTHREAD_ENABLED
+	if (!Thread::is_main_thread()) {
+		callable_mp_static(DisplayServerWeb::_update_voices_callback).bind(voices).call_deferred();
+		return;
+	}
+#endif
+
+	_update_voices_callback(voices);
+}
+
+void DisplayServerWeb::_update_voices_callback(const Vector<String> &p_voices) {
+	get_singleton()->voices.clear();
+	for (int i = 0; i < p_voices.size(); i++) {
+		Vector<String> tokens = p_voices[i].split(";", true, 2);
 		if (tokens.size() == 2) {
 			Dictionary voice_d;
 			voice_d["name"] = tokens[1];
@@ -334,7 +424,7 @@ void DisplayServerWeb::tts_speak(const String &p_text, const String &p_voice, in
 	CharString string = p_text.utf8();
 	utterance_ids[p_utterance_id] = string;
 
-	godot_js_tts_speak(string.get_data(), p_voice.utf8().get_data(), CLAMP(p_volume, 0, 100), CLAMP(p_pitch, 0.f, 2.f), CLAMP(p_rate, 0.1f, 10.f), p_utterance_id, DisplayServerWeb::_js_utterance_callback);
+	godot_js_tts_speak(string.get_data(), p_voice.utf8().get_data(), CLAMP(p_volume, 0, 100), CLAMP(p_pitch, 0.f, 2.f), CLAMP(p_rate, 0.1f, 10.f), p_utterance_id, DisplayServerWeb::js_utterance_callback);
 }
 
 void DisplayServerWeb::tts_pause() {
@@ -356,6 +446,17 @@ void DisplayServerWeb::tts_stop() {
 	godot_js_tts_stop();
 }
 
+void DisplayServerWeb::js_utterance_callback(int p_event, int p_id, int p_pos) {
+#ifdef PROXY_TO_PTHREAD_ENABLED
+	if (!Thread::is_main_thread()) {
+		callable_mp_static(DisplayServerWeb::_js_utterance_callback).bind(p_event, p_id, p_pos).call_deferred();
+		return;
+	}
+#endif
+
+	_js_utterance_callback(p_event, p_id, p_pos);
+}
+
 void DisplayServerWeb::_js_utterance_callback(int p_event, int p_id, int p_pos) {
 	DisplayServerWeb *ds = (DisplayServerWeb *)DisplayServer::get_singleton();
 	if (ds->utterance_ids.has(p_id)) {
@@ -507,6 +608,17 @@ Point2i DisplayServerWeb::mouse_get_position() const {
 
 // Wheel
 int DisplayServerWeb::mouse_wheel_callback(double p_delta_x, double p_delta_y) {
+#ifdef PROXY_TO_PTHREAD_ENABLED
+	if (!Thread::is_main_thread()) {
+		callable_mp_static(DisplayServerWeb::_mouse_wheel_callback).bind(p_delta_x, p_delta_y).call_deferred();
+		return true;
+	}
+#endif
+
+	return _mouse_wheel_callback(p_delta_x, p_delta_y);
+}
+
+int DisplayServerWeb::_mouse_wheel_callback(double p_delta_x, double p_delta_y) {
 	if (!godot_js_display_canvas_is_focused()) {
 		if (get_singleton()->cursor_inside_canvas) {
 			godot_js_display_canvas_focus();
@@ -559,6 +671,17 @@ int DisplayServerWeb::mouse_wheel_callback(double p_delta_x, double p_delta_y) {
 
 // Touch
 void DisplayServerWeb::touch_callback(int p_type, int p_count) {
+#ifdef PROXY_TO_PTHREAD_ENABLED
+	if (!Thread::is_main_thread()) {
+		callable_mp_static(DisplayServerWeb::_touch_callback).bind(p_type, p_count).call_deferred();
+		return;
+	}
+#endif
+
+	_touch_callback(p_type, p_count);
+}
+
+void DisplayServerWeb::_touch_callback(int p_type, int p_count) {
 	DisplayServerWeb *ds = get_singleton();
 
 	const JSTouchEvent &touch_event = ds->touch_event;
@@ -603,13 +726,25 @@ bool DisplayServerWeb::is_touchscreen_available() const {
 
 // Virtual Keyboard
 void DisplayServerWeb::vk_input_text_callback(const char *p_text, int p_cursor) {
+	String text = p_text;
+
+#ifdef PROXY_TO_PTHREAD_ENABLED
+	if (!Thread::is_main_thread()) {
+		callable_mp_static(DisplayServerWeb::_vk_input_text_callback).bind(text, p_cursor).call_deferred();
+		return;
+	}
+#endif
+
+	_vk_input_text_callback(text, p_cursor);
+}
+
+void DisplayServerWeb::_vk_input_text_callback(const String &p_text, int p_cursor) {
 	DisplayServerWeb *ds = DisplayServerWeb::get_singleton();
 	if (!ds || ds->input_text_callback.is_null()) {
 		return;
 	}
 	// Call input_text
-	Variant event = String::utf8(p_text);
-	ds->input_text_callback.call(event);
+	ds->input_text_callback.call(p_text);
 	// Insert key right to reach position.
 	Input *input = Input::get_singleton();
 	Ref<InputEventKey> k;
@@ -636,14 +771,39 @@ void DisplayServerWeb::virtual_keyboard_hide() {
 }
 
 void DisplayServerWeb::window_blur_callback() {
+#ifdef PROXY_TO_PTHREAD_ENABLED
+	if (!Thread::is_main_thread()) {
+		callable_mp_static(DisplayServerWeb::_window_blur_callback).call_deferred();
+		return;
+	}
+#endif
+
+	_window_blur_callback();
+}
+
+void DisplayServerWeb::_window_blur_callback() {
 	Input::get_singleton()->release_pressed_events();
 }
 
 // Gamepad
 void DisplayServerWeb::gamepad_callback(int p_index, int p_connected, const char *p_id, const char *p_guid) {
+	String id = p_id;
+	String guid = p_guid;
+
+#ifdef PROXY_TO_PTHREAD_ENABLED
+	if (!Thread::is_main_thread()) {
+		callable_mp_static(DisplayServerWeb::_gamepad_callback).bind(p_index, p_connected, id, guid).call_deferred();
+		return;
+	}
+#endif
+
+	_gamepad_callback(p_index, p_connected, id, guid);
+}
+
+void DisplayServerWeb::_gamepad_callback(int p_index, int p_connected, const String &p_id, const String &p_guid) {
 	Input *input = Input::get_singleton();
 	if (p_connected) {
-		input->joy_connection_changed(p_index, true, String::utf8(p_id), String::utf8(p_guid));
+		input->joy_connection_changed(p_index, true, p_id, p_guid);
 	} else {
 		input->joy_connection_changed(p_index, false, "");
 	}
@@ -687,7 +847,20 @@ Vector<String> DisplayServerWeb::get_rendering_drivers_func() {
 
 // Clipboard
 void DisplayServerWeb::update_clipboard_callback(const char *p_text) {
-	get_singleton()->clipboard = String::utf8(p_text);
+	String text = p_text;
+
+#ifdef PROXY_TO_PTHREAD_ENABLED
+	if (!Thread::is_main_thread()) {
+		callable_mp_static(DisplayServerWeb::_update_clipboard_callback).bind(text).call_deferred();
+		return;
+	}
+#endif
+
+	_update_clipboard_callback(text);
+}
+
+void DisplayServerWeb::_update_clipboard_callback(const String &p_text) {
+	get_singleton()->clipboard = p_text;
 }
 
 void DisplayServerWeb::clipboard_set(const String &p_text) {
@@ -702,6 +875,17 @@ String DisplayServerWeb::clipboard_get() const {
 }
 
 void DisplayServerWeb::send_window_event_callback(int p_notification) {
+#ifdef PROXY_TO_PTHREAD_ENABLED
+	if (!Thread::is_main_thread()) {
+		callable_mp_static(DisplayServerWeb::_send_window_event_callback).bind(p_notification).call_deferred();
+		return;
+	}
+#endif
+
+	_send_window_event_callback(p_notification);
+}
+
+void DisplayServerWeb::_send_window_event_callback(int p_notification) {
 	DisplayServerWeb *ds = get_singleton();
 	if (!ds) {
 		return;
@@ -816,19 +1000,19 @@ DisplayServerWeb::DisplayServerWeb(const String &p_rendering_driver, WindowMode
 	godot_js_input_mouse_wheel_cb(&DisplayServerWeb::mouse_wheel_callback);
 	godot_js_input_touch_cb(&DisplayServerWeb::touch_callback, touch_event.identifier, touch_event.coords);
 	godot_js_input_key_cb(&DisplayServerWeb::key_callback, key_event.code, key_event.key);
-	godot_js_input_paste_cb(update_clipboard_callback);
-	godot_js_input_drop_files_cb(drop_files_js_callback);
+	godot_js_input_paste_cb(&DisplayServerWeb::update_clipboard_callback);
+	godot_js_input_drop_files_cb(&DisplayServerWeb::drop_files_js_callback);
 	godot_js_input_gamepad_cb(&DisplayServerWeb::gamepad_callback);
 
 	// JS Display interface (js/libs/library_godot_display.js)
 	godot_js_display_fullscreen_cb(&DisplayServerWeb::fullscreen_change_callback);
-	godot_js_display_window_blur_cb(&window_blur_callback);
-	godot_js_display_notification_cb(&send_window_event_callback,
+	godot_js_display_window_blur_cb(&DisplayServerWeb::window_blur_callback);
+	godot_js_display_notification_cb(&DisplayServerWeb::send_window_event_callback,
 			WINDOW_EVENT_MOUSE_ENTER,
 			WINDOW_EVENT_MOUSE_EXIT,
 			WINDOW_EVENT_FOCUS_IN,
 			WINDOW_EVENT_FOCUS_OUT);
-	godot_js_display_vk_cb(&vk_input_text_callback);
+	godot_js_display_vk_cb(&DisplayServerWeb::vk_input_text_callback);
 
 	Input::get_singleton()->set_event_dispatch_function(_dispatch_input_event);
 }
diff --git a/platform/web/display_server_web.h b/platform/web/display_server_web.h
index 1653deff806..51c6ab3c0ac 100644
--- a/platform/web/display_server_web.h
+++ b/platform/web/display_server_web.h
@@ -91,28 +91,43 @@ private:
 
 	// events
 	WASM_EXPORT static void fullscreen_change_callback(int p_fullscreen);
+	static void _fullscreen_change_callback(int p_fullscreen);
 	WASM_EXPORT static int mouse_button_callback(int p_pressed, int p_button, double p_x, double p_y, int p_modifiers);
+	static int _mouse_button_callback(int p_pressed, int p_button, double p_x, double p_y, int p_modifiers);
 	WASM_EXPORT static void mouse_move_callback(double p_x, double p_y, double p_rel_x, double p_rel_y, int p_modifiers);
+	static void _mouse_move_callback(double p_x, double p_y, double p_rel_x, double p_rel_y, int p_modifiers);
 	WASM_EXPORT static int mouse_wheel_callback(double p_delta_x, double p_delta_y);
+	static int _mouse_wheel_callback(double p_delta_x, double p_delta_y);
 	WASM_EXPORT static void touch_callback(int p_type, int p_count);
+	static void _touch_callback(int p_type, int p_count);
 	WASM_EXPORT static void key_callback(int p_pressed, int p_repeat, int p_modifiers);
+	static void _key_callback(const String &p_key_event_code, const String &p_key_event_key, int p_pressed, int p_repeat, int p_modifiers);
 	WASM_EXPORT static void vk_input_text_callback(const char *p_text, int p_cursor);
+	static void _vk_input_text_callback(const String &p_text, int p_cursor);
 	WASM_EXPORT static void gamepad_callback(int p_index, int p_connected, const char *p_id, const char *p_guid);
+	static void _gamepad_callback(int p_index, int p_connected, const String &p_id, const String &p_guid);
+	WASM_EXPORT static void js_utterance_callback(int p_event, int p_id, int p_pos);
+	static void _js_utterance_callback(int p_event, int p_id, int p_pos);
+	WASM_EXPORT static void request_quit_callback();
+	static void _request_quit_callback();
+	WASM_EXPORT static void window_blur_callback();
+	static void _window_blur_callback();
+	WASM_EXPORT static void update_voices_callback(int p_size, const char **p_voice);
+	static void _update_voices_callback(const Vector<String> &p_voices);
+	WASM_EXPORT static void update_clipboard_callback(const char *p_text);
+	static void _update_clipboard_callback(const String &p_text);
+	WASM_EXPORT static void send_window_event_callback(int p_notification);
+	static void _send_window_event_callback(int p_notification);
+	WASM_EXPORT static void drop_files_js_callback(const char **p_filev, int p_filec);
+	static void _drop_files_js_callback(const Vector<String> &p_files);
+
 	void process_joypads();
-	WASM_EXPORT static void _js_utterance_callback(int p_event, int p_id, int p_pos);
 
 	static Vector<String> get_rendering_drivers_func();
 	static DisplayServer *create_func(const String &p_rendering_driver, WindowMode p_window_mode, VSyncMode p_vsync_mode, uint32_t p_flags, const Vector2i *p_position, const Vector2i &p_resolution, int p_screen, Error &r_error);
 
 	static void _dispatch_input_event(const Ref<InputEvent> &p_event);
 
-	WASM_EXPORT static void request_quit_callback();
-	WASM_EXPORT static void window_blur_callback();
-	WASM_EXPORT static void update_voices_callback(int p_size, const char **p_voice);
-	WASM_EXPORT static void update_clipboard_callback(const char *p_text);
-	WASM_EXPORT static void send_window_event_callback(int p_notification);
-	WASM_EXPORT static void drop_files_js_callback(char **p_filev, int p_filec);
-
 protected:
 	int get_current_video_driver() const;
 
diff --git a/platform/web/godot_js.h b/platform/web/godot_js.h
index f172148bf9c..031e67e4861 100644
--- a/platform/web/godot_js.h
+++ b/platform/web/godot_js.h
@@ -38,6 +38,7 @@ extern "C" {
 #endif
 
 #include <stddef.h>
+#include <stdint.h>
 
 // Config
 extern void godot_js_config_locale_get(char *p_ptr, int p_ptr_max);
@@ -69,7 +70,7 @@ extern int godot_js_input_gamepad_sample();
 extern int godot_js_input_gamepad_sample_count();
 extern int godot_js_input_gamepad_sample_get(int p_idx, float r_btns[16], int32_t *r_btns_num, float r_axes[10], int32_t *r_axes_num, int32_t *r_standard);
 extern void godot_js_input_paste_cb(void (*p_callback)(const char *p_text));
-extern void godot_js_input_drop_files_cb(void (*p_callback)(char **p_filev, int p_filec));
+extern void godot_js_input_drop_files_cb(void (*p_callback)(const char **p_filev, int p_filec));
 
 // TTS
 extern int godot_js_tts_is_speaking();
diff --git a/platform/web/godot_webgl2.h b/platform/web/godot_webgl2.h
index d2f46e125e6..3ade9e42391 100644
--- a/platform/web/godot_webgl2.h
+++ b/platform/web/godot_webgl2.h
@@ -44,6 +44,7 @@ extern "C" {
 #endif
 
 void godot_webgl2_glFramebufferTextureMultiviewOVR(GLenum target, GLenum attachment, GLuint texture, GLint level, GLint baseViewIndex, GLsizei numViews);
+void godot_webgl2_glGetBufferSubData(GLenum target, GLintptr offset, GLsizeiptr size, GLvoid *data);
 
 #define glFramebufferTextureMultiviewOVR godot_webgl2_glFramebufferTextureMultiviewOVR
 
diff --git a/platform/web/javascript_bridge_singleton.cpp b/platform/web/javascript_bridge_singleton.cpp
index 1bb72456e8f..2f0215e359c 100644
--- a/platform/web/javascript_bridge_singleton.cpp
+++ b/platform/web/javascript_bridge_singleton.cpp
@@ -72,7 +72,8 @@ private:
 	WASM_EXPORT static void _free_lock(void **p_lock, int p_type);
 	WASM_EXPORT static Variant _js2variant(int p_type, godot_js_wrapper_ex *p_val);
 	WASM_EXPORT static void *_alloc_variants(int p_size);
-	WASM_EXPORT static void _callback(void *p_ref, int p_arg_id, int p_argc);
+	WASM_EXPORT static void callback(void *p_ref, int p_arg_id, int p_argc);
+	static void _callback(const JavaScriptObjectImpl *obj, Variant arg);
 
 protected:
 	bool _set(const StringName &p_name, const Variant &p_value) override;
@@ -245,9 +246,10 @@ Variant JavaScriptObjectImpl::callp(const StringName &p_method, const Variant **
 	return _js2variant(type, &exchange);
 }
 
-void JavaScriptObjectImpl::_callback(void *p_ref, int p_args_id, int p_argc) {
+void JavaScriptObjectImpl::callback(void *p_ref, int p_args_id, int p_argc) {
 	const JavaScriptObjectImpl *obj = (JavaScriptObjectImpl *)p_ref;
 	ERR_FAIL_COND_MSG(obj->_callable.is_null(), "JavaScript callback failed.");
+
 	Vector<const Variant *> argp;
 	Array arg_arr;
 	for (int i = 0; i < p_argc; i++) {
@@ -256,7 +258,20 @@ void JavaScriptObjectImpl::_callback(void *p_ref, int p_args_id, int p_argc) {
 		int type = godot_js_wrapper_object_getvar(p_args_id, Variant::INT, &exchange);
 		arg_arr.push_back(_js2variant(type, &exchange));
 	}
-	obj->_callable.call(arg_arr);
+	Variant arg = arg_arr;
+
+#ifdef PROXY_TO_PTHREAD_ENABLED
+	if (!Thread::is_main_thread()) {
+		callable_mp_static(JavaScriptObjectImpl::_callback).bind(obj, arg).call_deferred();
+		return;
+	}
+#endif
+
+	_callback(obj, arg);
+}
+
+void JavaScriptObjectImpl::_callback(const JavaScriptObjectImpl *obj, Variant arg) {
+	obj->_callable.call(arg);
 
 	// Set return value
 	godot_js_wrapper_ex exchange;
@@ -273,7 +288,7 @@ void JavaScriptObjectImpl::_callback(void *p_ref, int p_args_id, int p_argc) {
 Ref<JavaScriptObject> JavaScriptBridge::create_callback(const Callable &p_callable) {
 	Ref<JavaScriptObjectImpl> out = memnew(JavaScriptObjectImpl);
 	out->_callable = p_callable;
-	out->_js_id = godot_js_wrapper_create_cb(out.ptr(), JavaScriptObjectImpl::_callback);
+	out->_js_id = godot_js_wrapper_create_cb(out.ptr(), JavaScriptObjectImpl::callback);
 	return out;
 }
 
diff --git a/platform/web/js/libs/library_godot_audio.js b/platform/web/js/libs/library_godot_audio.js
index cc86c810960..b54c5cac855 100644
--- a/platform/web/js/libs/library_godot_audio.js
+++ b/platform/web/js/libs/library_godot_audio.js
@@ -159,16 +159,19 @@ const GodotAudio = {
 		return 1;
 	},
 
+	godot_audio_has_worklet__proxy: 'sync',
 	godot_audio_has_worklet__sig: 'i',
 	godot_audio_has_worklet: function () {
 		return (GodotAudio.ctx && GodotAudio.ctx.audioWorklet) ? 1 : 0;
 	},
 
+	godot_audio_has_script_processor__proxy: 'sync',
 	godot_audio_has_script_processor__sig: 'i',
 	godot_audio_has_script_processor: function () {
 		return (GodotAudio.ctx && GodotAudio.ctx.createScriptProcessor) ? 1 : 0;
 	},
 
+	godot_audio_init__proxy: 'sync',
 	godot_audio_init__sig: 'iiiii',
 	godot_audio_init: function (p_mix_rate, p_latency, p_state_change, p_latency_update) {
 		const statechange = GodotRuntime.get_func(p_state_change);
@@ -179,6 +182,7 @@ const GodotAudio = {
 		return channels;
 	},
 
+	godot_audio_resume__proxy: 'sync',
 	godot_audio_resume__sig: 'v',
 	godot_audio_resume: function () {
 		if (GodotAudio.ctx && GodotAudio.ctx.state !== 'running') {
@@ -358,6 +362,7 @@ const GodotAudioWorklet = {
 		},
 	},
 
+	godot_audio_worklet_create__proxy: 'sync',
 	godot_audio_worklet_create__sig: 'ii',
 	godot_audio_worklet_create: function (channels) {
 		try {
@@ -369,6 +374,7 @@ const GodotAudioWorklet = {
 		return 0;
 	},
 
+	godot_audio_worklet_start__proxy: 'sync',
 	godot_audio_worklet_start__sig: 'viiiii',
 	godot_audio_worklet_start: function (p_in_buf, p_in_size, p_out_buf, p_out_size, p_state) {
 		const out_buffer = GodotRuntime.heapSub(HEAPF32, p_out_buf, p_out_size);
@@ -377,6 +383,7 @@ const GodotAudioWorklet = {
 		GodotAudioWorklet.start(in_buffer, out_buffer, state);
 	},
 
+	godot_audio_worklet_start_no_threads__proxy: 'sync',
 	godot_audio_worklet_start_no_threads__sig: 'viiiiii',
 	godot_audio_worklet_start_no_threads: function (p_out_buf, p_out_size, p_out_callback, p_in_buf, p_in_size, p_in_callback) {
 		const out_callback = GodotRuntime.get_func(p_out_callback);
@@ -465,6 +472,7 @@ const GodotAudioScript = {
 		},
 	},
 
+	godot_audio_script_create__proxy: 'sync',
 	godot_audio_script_create__sig: 'iii',
 	godot_audio_script_create: function (buffer_length, channel_count) {
 		const buf_len = GodotRuntime.getHeapValue(buffer_length, 'i32');
@@ -478,6 +486,7 @@ const GodotAudioScript = {
 		return 0;
 	},
 
+	godot_audio_script_start__proxy: 'sync',
 	godot_audio_script_start__sig: 'viiiii',
 	godot_audio_script_start: function (p_in_buf, p_in_size, p_out_buf, p_out_size, p_cb) {
 		const onprocess = GodotRuntime.get_func(p_cb);
diff --git a/platform/web/js/libs/library_godot_display.js b/platform/web/js/libs/library_godot_display.js
index c60e6899f2b..99fc429d8ff 100644
--- a/platform/web/js/libs/library_godot_display.js
+++ b/platform/web/js/libs/library_godot_display.js
@@ -345,6 +345,7 @@ const GodotDisplay = {
 		},
 	},
 
+	godot_js_display_is_swap_ok_cancel__proxy: 'sync',
 	godot_js_display_is_swap_ok_cancel__sig: 'i',
 	godot_js_display_is_swap_ok_cancel: function () {
 		const win = (['Windows', 'Win64', 'Win32', 'WinCE']);
@@ -355,16 +356,19 @@ const GodotDisplay = {
 		return 0;
 	},
 
+	godot_js_tts_is_speaking__proxy: 'sync',
 	godot_js_tts_is_speaking__sig: 'i',
 	godot_js_tts_is_speaking: function () {
 		return window.speechSynthesis.speaking;
 	},
 
+	godot_js_tts_is_paused__proxy: 'sync',
 	godot_js_tts_is_paused__sig: 'i',
 	godot_js_tts_is_paused: function () {
 		return window.speechSynthesis.paused;
 	},
 
+	godot_js_tts_get_voices__proxy: 'sync',
 	godot_js_tts_get_voices__sig: 'vi',
 	godot_js_tts_get_voices: function (p_callback) {
 		const func = GodotRuntime.get_func(p_callback);
@@ -382,6 +386,7 @@ const GodotDisplay = {
 		}
 	},
 
+	godot_js_tts_speak__proxy: 'sync',
 	godot_js_tts_speak__sig: 'viiiffii',
 	godot_js_tts_speak: function (p_text, p_voice, p_volume, p_pitch, p_rate, p_utterance_id, p_callback) {
 		const func = GodotRuntime.get_func(p_callback);
@@ -424,53 +429,63 @@ const GodotDisplay = {
 		window.speechSynthesis.speak(utterance);
 	},
 
+	godot_js_tts_pause__proxy: 'sync',
 	godot_js_tts_pause__sig: 'v',
 	godot_js_tts_pause: function () {
 		window.speechSynthesis.pause();
 	},
 
+	godot_js_tts_resume__proxy: 'sync',
 	godot_js_tts_resume__sig: 'v',
 	godot_js_tts_resume: function () {
 		window.speechSynthesis.resume();
 	},
 
+	godot_js_tts_stop__proxy: 'sync',
 	godot_js_tts_stop__sig: 'v',
 	godot_js_tts_stop: function () {
 		window.speechSynthesis.cancel();
 		window.speechSynthesis.resume();
 	},
 
+	godot_js_display_alert__proxy: 'sync',
 	godot_js_display_alert__sig: 'vi',
 	godot_js_display_alert: function (p_text) {
 		window.alert(GodotRuntime.parseString(p_text)); // eslint-disable-line no-alert
 	},
 
+	godot_js_display_screen_dpi_get__proxy: 'sync',
 	godot_js_display_screen_dpi_get__sig: 'i',
 	godot_js_display_screen_dpi_get: function () {
 		return GodotDisplay.getDPI();
 	},
 
+	godot_js_display_pixel_ratio_get__proxy: 'sync',
 	godot_js_display_pixel_ratio_get__sig: 'f',
 	godot_js_display_pixel_ratio_get: function () {
 		return GodotDisplayScreen.getPixelRatio();
 	},
 
+	godot_js_display_fullscreen_request__proxy: 'sync',
 	godot_js_display_fullscreen_request__sig: 'i',
 	godot_js_display_fullscreen_request: function () {
 		return GodotDisplayScreen.requestFullscreen();
 	},
 
+	godot_js_display_fullscreen_exit__proxy: 'sync',
 	godot_js_display_fullscreen_exit__sig: 'i',
 	godot_js_display_fullscreen_exit: function () {
 		return GodotDisplayScreen.exitFullscreen();
 	},
 
+	godot_js_display_desired_size_set__proxy: 'sync',
 	godot_js_display_desired_size_set__sig: 'vii',
 	godot_js_display_desired_size_set: function (width, height) {
 		GodotDisplayScreen.desired_size = [width, height];
 		GodotDisplayScreen.updateSize();
 	},
 
+	godot_js_display_size_update__proxy: 'sync',
 	godot_js_display_size_update__sig: 'i',
 	godot_js_display_size_update: function () {
 		const updated = GodotDisplayScreen.updateSize();
@@ -480,6 +495,7 @@ const GodotDisplay = {
 		return updated;
 	},
 
+	godot_js_display_screen_size_get__proxy: 'sync',
 	godot_js_display_screen_size_get__sig: 'vii',
 	godot_js_display_screen_size_get: function (width, height) {
 		const scale = GodotDisplayScreen.getPixelRatio();
@@ -487,12 +503,14 @@ const GodotDisplay = {
 		GodotRuntime.setHeapValue(height, window.screen.height * scale, 'i32');
 	},
 
+	godot_js_display_window_size_get__proxy: 'sync',
 	godot_js_display_window_size_get__sig: 'vii',
 	godot_js_display_window_size_get: function (p_width, p_height) {
 		GodotRuntime.setHeapValue(p_width, GodotConfig.canvas.width, 'i32');
 		GodotRuntime.setHeapValue(p_height, GodotConfig.canvas.height, 'i32');
 	},
 
+	godot_js_display_has_webgl__proxy: 'sync',
 	godot_js_display_has_webgl__sig: 'ii',
 	godot_js_display_has_webgl: function (p_version) {
 		if (p_version !== 1 && p_version !== 2) {
@@ -507,11 +525,13 @@ const GodotDisplay = {
 	/*
 	 * Canvas
 	 */
+	godot_js_display_canvas_focus__proxy: 'sync',
 	godot_js_display_canvas_focus__sig: 'v',
 	godot_js_display_canvas_focus: function () {
 		GodotConfig.canvas.focus();
 	},
 
+	godot_js_display_canvas_is_focused__proxy: 'sync',
 	godot_js_display_canvas_is_focused__sig: 'i',
 	godot_js_display_canvas_is_focused: function () {
 		return document.activeElement === GodotConfig.canvas;
@@ -520,6 +540,7 @@ const GodotDisplay = {
 	/*
 	 * Touchscreen
 	 */
+	godot_js_display_touchscreen_is_available__proxy: 'sync',
 	godot_js_display_touchscreen_is_available__sig: 'i',
 	godot_js_display_touchscreen_is_available: function () {
 		return 'ontouchstart' in window;
@@ -528,6 +549,7 @@ const GodotDisplay = {
 	/*
 	 * Clipboard
 	 */
+	godot_js_display_clipboard_set__proxy: 'sync',
 	godot_js_display_clipboard_set__sig: 'ii',
 	godot_js_display_clipboard_set: function (p_text) {
 		const text = GodotRuntime.parseString(p_text);
@@ -541,6 +563,7 @@ const GodotDisplay = {
 		return 0;
 	},
 
+	godot_js_display_clipboard_get__proxy: 'sync',
 	godot_js_display_clipboard_get__sig: 'ii',
 	godot_js_display_clipboard_get: function (callback) {
 		const func = GodotRuntime.get_func(callback);
@@ -560,11 +583,13 @@ const GodotDisplay = {
 	/*
 	 * Window
 	 */
+	godot_js_display_window_title_set__proxy: 'sync',
 	godot_js_display_window_title_set__sig: 'vi',
 	godot_js_display_window_title_set: function (p_data) {
 		document.title = GodotRuntime.parseString(p_data);
 	},
 
+	godot_js_display_window_icon_set__proxy: 'sync',
 	godot_js_display_window_icon_set__sig: 'vii',
 	godot_js_display_window_icon_set: function (p_ptr, p_len) {
 		let link = document.getElementById('-gd-engine-icon');
@@ -593,6 +618,7 @@ const GodotDisplay = {
 	/*
 	 * Cursor
 	 */
+	godot_js_display_cursor_set_visible__proxy: 'sync',
 	godot_js_display_cursor_set_visible__sig: 'vi',
 	godot_js_display_cursor_set_visible: function (p_visible) {
 		const visible = p_visible !== 0;
@@ -607,16 +633,19 @@ const GodotDisplay = {
 		}
 	},
 
+	godot_js_display_cursor_is_hidden__proxy: 'sync',
 	godot_js_display_cursor_is_hidden__sig: 'i',
 	godot_js_display_cursor_is_hidden: function () {
 		return !GodotDisplayCursor.visible;
 	},
 
+	godot_js_display_cursor_set_shape__proxy: 'sync',
 	godot_js_display_cursor_set_shape__sig: 'vi',
 	godot_js_display_cursor_set_shape: function (p_string) {
 		GodotDisplayCursor.set_shape(GodotRuntime.parseString(p_string));
 	},
 
+	godot_js_display_cursor_set_custom_shape__proxy: 'sync',
 	godot_js_display_cursor_set_custom_shape__sig: 'viiiii',
 	godot_js_display_cursor_set_custom_shape: function (p_shape, p_ptr, p_len, p_hotspot_x, p_hotspot_y) {
 		const shape = GodotRuntime.parseString(p_shape);
@@ -640,6 +669,7 @@ const GodotDisplay = {
 		}
 	},
 
+	godot_js_display_cursor_lock_set__proxy: 'sync',
 	godot_js_display_cursor_lock_set__sig: 'vi',
 	godot_js_display_cursor_lock_set: function (p_lock) {
 		if (p_lock) {
@@ -649,6 +679,7 @@ const GodotDisplay = {
 		}
 	},
 
+	godot_js_display_cursor_is_locked__proxy: 'sync',
 	godot_js_display_cursor_is_locked__sig: 'i',
 	godot_js_display_cursor_is_locked: function () {
 		return GodotDisplayCursor.isPointerLocked() ? 1 : 0;
@@ -657,6 +688,7 @@ const GodotDisplay = {
 	/*
 	 * Listeners
 	 */
+	godot_js_display_fullscreen_cb__proxy: 'sync',
 	godot_js_display_fullscreen_cb__sig: 'vi',
 	godot_js_display_fullscreen_cb: function (callback) {
 		const canvas = GodotConfig.canvas;
@@ -671,6 +703,7 @@ const GodotDisplay = {
 		GodotEventListeners.add(document, 'webkitfullscreenchange', change_cb, false);
 	},
 
+	godot_js_display_window_blur_cb__proxy: 'sync',
 	godot_js_display_window_blur_cb__sig: 'vi',
 	godot_js_display_window_blur_cb: function (callback) {
 		const func = GodotRuntime.get_func(callback);
@@ -679,6 +712,7 @@ const GodotDisplay = {
 		}, false);
 	},
 
+	godot_js_display_notification_cb__proxy: 'sync',
 	godot_js_display_notification_cb__sig: 'viiiii',
 	godot_js_display_notification_cb: function (callback, p_enter, p_exit, p_in, p_out) {
 		const canvas = GodotConfig.canvas;
@@ -691,6 +725,7 @@ const GodotDisplay = {
 		});
 	},
 
+	godot_js_display_setup_canvas__proxy: 'sync',
 	godot_js_display_setup_canvas__sig: 'viiii',
 	godot_js_display_setup_canvas: function (p_width, p_height, p_fullscreen, p_hidpi) {
 		const canvas = GodotConfig.canvas;
@@ -725,6 +760,7 @@ const GodotDisplay = {
 	/*
 	 * Virtual Keyboard
 	 */
+	godot_js_display_vk_show__proxy: 'sync',
 	godot_js_display_vk_show__sig: 'viiii',
 	godot_js_display_vk_show: function (p_text, p_type, p_start, p_end) {
 		const text = GodotRuntime.parseString(p_text);
@@ -733,21 +769,25 @@ const GodotDisplay = {
 		GodotDisplayVK.show(text, p_type, start, end);
 	},
 
+	godot_js_display_vk_hide__proxy: 'sync',
 	godot_js_display_vk_hide__sig: 'v',
 	godot_js_display_vk_hide: function () {
 		GodotDisplayVK.hide();
 	},
 
+	godot_js_display_vk_available__proxy: 'sync',
 	godot_js_display_vk_available__sig: 'i',
 	godot_js_display_vk_available: function () {
 		return GodotDisplayVK.available();
 	},
 
+	godot_js_display_tts_available__proxy: 'sync',
 	godot_js_display_tts_available__sig: 'i',
 	godot_js_display_tts_available: function () {
 		return 'speechSynthesis' in window;
 	},
 
+	godot_js_display_vk_cb__proxy: 'sync',
 	godot_js_display_vk_cb__sig: 'vi',
 	godot_js_display_vk_cb: function (p_input_cb) {
 		const input_cb = GodotRuntime.get_func(p_input_cb);
diff --git a/platform/web/js/libs/library_godot_fetch.js b/platform/web/js/libs/library_godot_fetch.js
index 4ef24903e38..00616bc1a5d 100644
--- a/platform/web/js/libs/library_godot_fetch.js
+++ b/platform/web/js/libs/library_godot_fetch.js
@@ -125,6 +125,7 @@ const GodotFetch = {
 		},
 	},
 
+	godot_js_fetch_create__proxy: 'sync',
 	godot_js_fetch_create__sig: 'iiiiiii',
 	godot_js_fetch_create: function (p_method, p_url, p_headers, p_headers_size, p_body, p_body_size) {
 		const method = GodotRuntime.parseString(p_method);
@@ -145,6 +146,7 @@ const GodotFetch = {
 		}), body);
 	},
 
+	godot_js_fetch_state_get__proxy: 'sync',
 	godot_js_fetch_state_get__sig: 'ii',
 	godot_js_fetch_state_get: function (p_id) {
 		const obj = IDHandler.get(p_id);
@@ -166,6 +168,7 @@ const GodotFetch = {
 		return -1;
 	},
 
+	godot_js_fetch_http_status_get__proxy: 'sync',
 	godot_js_fetch_http_status_get__sig: 'ii',
 	godot_js_fetch_http_status_get: function (p_id) {
 		const obj = IDHandler.get(p_id);
@@ -175,6 +178,7 @@ const GodotFetch = {
 		return obj.status;
 	},
 
+	godot_js_fetch_read_headers__proxy: 'sync',
 	godot_js_fetch_read_headers__sig: 'iiii',
 	godot_js_fetch_read_headers: function (p_id, p_parse_cb, p_ref) {
 		const obj = IDHandler.get(p_id);
@@ -192,6 +196,7 @@ const GodotFetch = {
 		return 0;
 	},
 
+	godot_js_fetch_read_chunk__proxy: 'sync',
 	godot_js_fetch_read_chunk__sig: 'iiii',
 	godot_js_fetch_read_chunk: function (p_id, p_buf, p_buf_size) {
 		const obj = IDHandler.get(p_id);
@@ -218,6 +223,7 @@ const GodotFetch = {
 		return p_buf_size - to_read;
 	},
 
+	godot_js_fetch_is_chunked__proxy: 'sync',
 	godot_js_fetch_is_chunked__sig: 'ii',
 	godot_js_fetch_is_chunked: function (p_id) {
 		const obj = IDHandler.get(p_id);
@@ -227,6 +233,7 @@ const GodotFetch = {
 		return obj.chunked ? 1 : 0;
 	},
 
+	godot_js_fetch_free__proxy: 'sync',
 	godot_js_fetch_free__sig: 'vi',
 	godot_js_fetch_free: function (id) {
 		GodotFetch.free(id);
diff --git a/platform/web/js/libs/library_godot_input.js b/platform/web/js/libs/library_godot_input.js
index 1b221e78b37..92113e85c91 100644
--- a/platform/web/js/libs/library_godot_input.js
+++ b/platform/web/js/libs/library_godot_input.js
@@ -356,6 +356,7 @@ const GodotInput = {
 	/*
 	 * Mouse API
 	 */
+	godot_js_input_mouse_move_cb__proxy: 'sync',
 	godot_js_input_mouse_move_cb__sig: 'vi',
 	godot_js_input_mouse_move_cb: function (callback) {
 		const func = GodotRuntime.get_func(callback);
@@ -374,6 +375,7 @@ const GodotInput = {
 		GodotEventListeners.add(window, 'mousemove', move_cb, false);
 	},
 
+	godot_js_input_mouse_wheel_cb__proxy: 'sync',
 	godot_js_input_mouse_wheel_cb__sig: 'vi',
 	godot_js_input_mouse_wheel_cb: function (callback) {
 		const func = GodotRuntime.get_func(callback);
@@ -385,6 +387,7 @@ const GodotInput = {
 		GodotEventListeners.add(GodotConfig.canvas, 'wheel', wheel_cb, false);
 	},
 
+	godot_js_input_mouse_button_cb__proxy: 'sync',
 	godot_js_input_mouse_button_cb__sig: 'vi',
 	godot_js_input_mouse_button_cb: function (callback) {
 		const func = GodotRuntime.get_func(callback);
@@ -409,6 +412,7 @@ const GodotInput = {
 	/*
 	 * Touch API
 	 */
+	godot_js_input_touch_cb__proxy: 'sync',
 	godot_js_input_touch_cb__sig: 'viii',
 	godot_js_input_touch_cb: function (callback, ids, coords) {
 		const func = GodotRuntime.get_func(callback);
@@ -442,6 +446,7 @@ const GodotInput = {
 	/*
 	 * Key API
 	 */
+	godot_js_input_key_cb__proxy: 'sync',
 	godot_js_input_key_cb__sig: 'viii',
 	godot_js_input_key_cb: function (callback, code, key) {
 		const func = GodotRuntime.get_func(callback);
@@ -459,23 +464,27 @@ const GodotInput = {
 	/*
 	 * Gamepad API
 	 */
+	godot_js_input_gamepad_cb__proxy: 'sync',
 	godot_js_input_gamepad_cb__sig: 'vi',
 	godot_js_input_gamepad_cb: function (change_cb) {
 		const onchange = GodotRuntime.get_func(change_cb);
 		GodotInputGamepads.init(onchange);
 	},
 
+	godot_js_input_gamepad_sample_count__proxy: 'sync',
 	godot_js_input_gamepad_sample_count__sig: 'i',
 	godot_js_input_gamepad_sample_count: function () {
 		return GodotInputGamepads.get_samples().length;
 	},
 
+	godot_js_input_gamepad_sample__proxy: 'sync',
 	godot_js_input_gamepad_sample__sig: 'i',
 	godot_js_input_gamepad_sample: function () {
 		GodotInputGamepads.sample();
 		return 0;
 	},
 
+	godot_js_input_gamepad_sample_get__proxy: 'sync',
 	godot_js_input_gamepad_sample_get__sig: 'iiiiiii',
 	godot_js_input_gamepad_sample_get: function (p_index, r_btns, r_btns_num, r_axes, r_axes_num, r_standard) {
 		const sample = GodotInputGamepads.get_sample(p_index);
@@ -502,6 +511,7 @@ const GodotInput = {
 	/*
 	 * Drag/Drop API
 	 */
+	godot_js_input_drop_files_cb__proxy: 'sync',
 	godot_js_input_drop_files_cb__sig: 'vi',
 	godot_js_input_drop_files_cb: function (callback) {
 		const func = GodotRuntime.get_func(callback);
@@ -524,6 +534,7 @@ const GodotInput = {
 	},
 
 	/* Paste API */
+	godot_js_input_paste_cb__proxy: 'sync',
 	godot_js_input_paste_cb__sig: 'vi',
 	godot_js_input_paste_cb: function (callback) {
 		const func = GodotRuntime.get_func(callback);
@@ -535,6 +546,7 @@ const GodotInput = {
 		}, false);
 	},
 
+	godot_js_input_vibrate_handheld__proxy: 'sync',
 	godot_js_input_vibrate_handheld__sig: 'vi',
 	godot_js_input_vibrate_handheld: function (p_duration_ms) {
 		if (typeof navigator.vibrate !== 'function') {
diff --git a/platform/web/js/libs/library_godot_javascript_singleton.js b/platform/web/js/libs/library_godot_javascript_singleton.js
index 1764c9a0266..b17fde15448 100644
--- a/platform/web/js/libs/library_godot_javascript_singleton.js
+++ b/platform/web/js/libs/library_godot_javascript_singleton.js
@@ -121,6 +121,7 @@ const GodotJSWrapper = {
 		},
 	},
 
+	godot_js_wrapper_interface_get__proxy: 'sync',
 	godot_js_wrapper_interface_get__sig: 'ii',
 	godot_js_wrapper_interface_get: function (p_name) {
 		const name = GodotRuntime.parseString(p_name);
@@ -130,6 +131,7 @@ const GodotJSWrapper = {
 		return 0;
 	},
 
+	godot_js_wrapper_object_get__proxy: 'sync',
 	godot_js_wrapper_object_get__sig: 'iiii',
 	godot_js_wrapper_object_get: function (p_id, p_exchange, p_prop) {
 		const obj = GodotJSWrapper.get_proxied_value(p_id);
@@ -148,6 +150,7 @@ const GodotJSWrapper = {
 		return GodotJSWrapper.js2variant(obj, p_exchange);
 	},
 
+	godot_js_wrapper_object_set__proxy: 'sync',
 	godot_js_wrapper_object_set__sig: 'viiii',
 	godot_js_wrapper_object_set: function (p_id, p_name, p_type, p_exchange) {
 		const obj = GodotJSWrapper.get_proxied_value(p_id);
@@ -162,6 +165,7 @@ const GodotJSWrapper = {
 		}
 	},
 
+	godot_js_wrapper_object_call__proxy: 'sync',
 	godot_js_wrapper_object_call__sig: 'iiiiiiiii',
 	godot_js_wrapper_object_call: function (p_id, p_method, p_args, p_argc, p_convert_callback, p_exchange, p_lock, p_free_lock_callback) {
 		const obj = GodotJSWrapper.get_proxied_value(p_id);
@@ -189,6 +193,7 @@ const GodotJSWrapper = {
 		}
 	},
 
+	godot_js_wrapper_object_unref__proxy: 'sync',
 	godot_js_wrapper_object_unref__sig: 'vi',
 	godot_js_wrapper_object_unref: function (p_id) {
 		const proxy = IDHandler.get(p_id);
@@ -197,6 +202,7 @@ const GodotJSWrapper = {
 		}
 	},
 
+	godot_js_wrapper_create_cb__proxy: 'sync',
 	godot_js_wrapper_create_cb__sig: 'iii',
 	godot_js_wrapper_create_cb: function (p_ref, p_func) {
 		const func = GodotRuntime.get_func(p_func);
@@ -221,11 +227,13 @@ const GodotJSWrapper = {
 		return id;
 	},
 
+	godot_js_wrapper_object_set_cb_ret__proxy: 'sync',
 	godot_js_wrapper_object_set_cb_ret__sig: 'vii',
 	godot_js_wrapper_object_set_cb_ret: function (p_val_type, p_val_ex) {
 		GodotJSWrapper.cb_ret = GodotJSWrapper.variant2js(p_val_type, p_val_ex);
 	},
 
+	godot_js_wrapper_object_getvar__proxy: 'sync',
 	godot_js_wrapper_object_getvar__sig: 'iiii',
 	godot_js_wrapper_object_getvar: function (p_id, p_type, p_exchange) {
 		const obj = GodotJSWrapper.get_proxied_value(p_id);
@@ -244,6 +252,7 @@ const GodotJSWrapper = {
 		}
 	},
 
+	godot_js_wrapper_object_setvar__proxy: 'sync',
 	godot_js_wrapper_object_setvar__sig: 'iiiiii',
 	godot_js_wrapper_object_setvar: function (p_id, p_key_type, p_key_ex, p_val_type, p_val_ex) {
 		const obj = GodotJSWrapper.get_proxied_value(p_id);
@@ -260,6 +269,7 @@ const GodotJSWrapper = {
 		}
 	},
 
+	godot_js_wrapper_create_object__proxy: 'sync',
 	godot_js_wrapper_create_object__sig: 'iiiiiiii',
 	godot_js_wrapper_create_object: function (p_object, p_args, p_argc, p_convert_callback, p_exchange, p_lock, p_free_lock_callback) {
 		const name = GodotRuntime.parseString(p_object);
diff --git a/platform/web/js/libs/library_godot_os.js b/platform/web/js/libs/library_godot_os.js
index 00ae3995831..92635cb6ae8 100644
--- a/platform/web/js/libs/library_godot_os.js
+++ b/platform/web/js/libs/library_godot_os.js
@@ -91,11 +91,13 @@ const GodotConfig = {
 		},
 	},
 
+	godot_js_config_canvas_id_get__proxy: 'sync',
 	godot_js_config_canvas_id_get__sig: 'vii',
 	godot_js_config_canvas_id_get: function (p_ptr, p_ptr_max) {
 		GodotRuntime.stringToHeap(`#${GodotConfig.canvas.id}`, p_ptr, p_ptr_max);
 	},
 
+	godot_js_config_locale_get__proxy: 'sync',
 	godot_js_config_locale_get__sig: 'vii',
 	godot_js_config_locale_get: function (p_ptr, p_ptr_max) {
 		GodotRuntime.stringToHeap(GodotConfig.locale, p_ptr, p_ptr_max);
@@ -266,22 +268,26 @@ const GodotOS = {
 		},
 	},
 
+	godot_js_os_finish_async__proxy: 'sync',
 	godot_js_os_finish_async__sig: 'vi',
 	godot_js_os_finish_async: function (p_callback) {
 		const func = GodotRuntime.get_func(p_callback);
 		GodotOS.finish_async(func);
 	},
 
+	godot_js_os_request_quit_cb__proxy: 'sync',
 	godot_js_os_request_quit_cb__sig: 'vi',
 	godot_js_os_request_quit_cb: function (p_callback) {
 		GodotOS.request_quit = GodotRuntime.get_func(p_callback);
 	},
 
+	godot_js_os_fs_is_persistent__proxy: 'sync',
 	godot_js_os_fs_is_persistent__sig: 'i',
 	godot_js_os_fs_is_persistent: function () {
 		return GodotFS.is_persistent();
 	},
 
+	godot_js_os_fs_sync__proxy: 'sync',
 	godot_js_os_fs_sync__sig: 'vi',
 	godot_js_os_fs_sync: function (callback) {
 		const func = GodotRuntime.get_func(callback);
@@ -291,6 +297,7 @@ const GodotOS = {
 		});
 	},
 
+	godot_js_os_has_feature__proxy: 'sync',
 	godot_js_os_has_feature__sig: 'ii',
 	godot_js_os_has_feature: function (p_ftr) {
 		const ftr = GodotRuntime.parseString(p_ftr);
@@ -313,6 +320,7 @@ const GodotOS = {
 		return 0;
 	},
 
+	godot_js_os_execute__proxy: 'sync',
 	godot_js_os_execute__sig: 'ii',
 	godot_js_os_execute: function (p_json) {
 		const json_args = GodotRuntime.parseString(p_json);
@@ -324,11 +332,13 @@ const GodotOS = {
 		return 1;
 	},
 
+	godot_js_os_shell_open__proxy: 'sync',
 	godot_js_os_shell_open__sig: 'vi',
 	godot_js_os_shell_open: function (p_uri) {
 		window.open(GodotRuntime.parseString(p_uri), '_blank');
 	},
 
+	godot_js_os_hw_concurrency_get__proxy: 'sync',
 	godot_js_os_hw_concurrency_get__sig: 'i',
 	godot_js_os_hw_concurrency_get: function () {
 		// TODO Godot core needs fixing to avoid spawning too many threads (> 24).
@@ -336,6 +346,7 @@ const GodotOS = {
 		return concurrency < 2 ? concurrency : 2;
 	},
 
+	godot_js_os_download_buffer__proxy: 'sync',
 	godot_js_os_download_buffer__sig: 'viiii',
 	godot_js_os_download_buffer: function (p_ptr, p_size, p_name, p_mime) {
 		const buf = GodotRuntime.heapSlice(HEAP8, p_ptr, p_size);
@@ -426,6 +437,7 @@ const GodotPWA = {
 		},
 	},
 
+	godot_js_pwa_cb__proxy: 'sync',
 	godot_js_pwa_cb__sig: 'vi',
 	godot_js_pwa_cb: function (p_update_cb) {
 		if ('serviceWorker' in navigator) {
@@ -434,6 +446,7 @@ const GodotPWA = {
 		}
 	},
 
+	godot_js_pwa_update__proxy: 'sync',
 	godot_js_pwa_update__sig: 'i',
 	godot_js_pwa_update: function () {
 		if ('serviceWorker' in navigator && GodotPWA.hasUpdate) {
diff --git a/platform/web/js/libs/library_godot_webgl2.js b/platform/web/js/libs/library_godot_webgl2.js
index 3c6de4a0717..dbaec9f01b1 100644
--- a/platform/web/js/libs/library_godot_webgl2.js
+++ b/platform/web/js/libs/library_godot_webgl2.js
@@ -32,6 +32,19 @@ const GodotWebGL2 = {
 	$GodotWebGL2__deps: ['$GL', '$GodotRuntime'],
 	$GodotWebGL2: {},
 
+	// This is implemented as "glGetBufferSubData" in new emscripten versions.
+	// Since we have to support older (pre 2.0.17) emscripten versions, we add this wrapper function instead.
+	godot_webgl2_glGetBufferSubData__proxy: 'sync',
+	godot_webgl2_glGetBufferSubData__sig: 'vippp',
+	godot_webgl2_glGetBufferSubData__deps: ['$GL', 'emscripten_webgl_get_current_context'],
+	godot_webgl2_glGetBufferSubData: function (target, offset, size, data) {
+		const gl_context_handle = _emscripten_webgl_get_current_context(); // eslint-disable-line no-undef
+		const gl = GL.getContext(gl_context_handle);
+		if (gl) {
+			gl.GLctx['getBufferSubData'](target, offset, HEAPU8, data, size);
+		}
+	},
+
 	godot_webgl2_glFramebufferTextureMultiviewOVR__deps: ['emscripten_webgl_get_current_context'],
 	godot_webgl2_glFramebufferTextureMultiviewOVR__proxy: 'sync',
 	godot_webgl2_glFramebufferTextureMultiviewOVR__sig: 'viiiiii',
diff --git a/platform/web/os_web.cpp b/platform/web/os_web.cpp
index 186e4abf92e..cbdcbf565d2 100644
--- a/platform/web/os_web.cpp
+++ b/platform/web/os_web.cpp
@@ -160,6 +160,12 @@ String OS_Web::get_name() const {
 	return "Web";
 }
 
+void OS_Web::add_frame_delay(bool p_can_draw) {
+#ifndef PROXY_TO_PTHREAD_ENABLED
+	OS::add_frame_delay(p_can_draw);
+#endif
+}
+
 void OS_Web::vibrate_handheld(int p_duration_ms) {
 	godot_js_input_vibrate_handheld(p_duration_ms);
 }
diff --git a/platform/web/os_web.h b/platform/web/os_web.h
index f262337f008..5a48997c173 100644
--- a/platform/web/os_web.h
+++ b/platform/web/os_web.h
@@ -91,9 +91,10 @@ public:
 	String get_executable_path() const override;
 	Error shell_open(String p_uri) override;
 	String get_name() const override;
+
 	// Override default OS implementation which would block the main thread with delay_usec.
 	// Implemented in web_main.cpp loop callback instead.
-	void add_frame_delay(bool p_can_draw) override {}
+	void add_frame_delay(bool p_can_draw) override;
 
 	void vibrate_handheld(int p_duration_ms) override;
 
diff --git a/platform/web/web_main.cpp b/platform/web/web_main.cpp
index f199f8ffd8c..ad2a801881a 100644
--- a/platform/web/web_main.cpp
+++ b/platform/web/web_main.cpp
@@ -40,7 +40,10 @@
 #include <stdlib.h>
 
 static OS_Web *os = nullptr;
+#ifndef PROXY_TO_PTHREAD_ENABLED
 static uint64_t target_ticks = 0;
+#endif
+
 static bool main_started = false;
 static bool shutdown_complete = false;
 
@@ -63,15 +66,20 @@ void cleanup_after_sync() {
 }
 
 void main_loop_callback() {
+#ifndef PROXY_TO_PTHREAD_ENABLED
 	uint64_t current_ticks = os->get_ticks_usec();
+#endif
 
 	bool force_draw = DisplayServerWeb::get_singleton()->check_size_force_redraw();
 	if (force_draw) {
 		Main::force_redraw();
+#ifndef PROXY_TO_PTHREAD_ENABLED
 	} else if (current_ticks < target_ticks) {
 		return; // Skip frame.
+#endif
 	}
 
+#ifndef PROXY_TO_PTHREAD_ENABLED
 	int max_fps = Engine::get_singleton()->get_max_fps();
 	if (max_fps > 0) {
 		if (current_ticks - target_ticks > 1000000) {
@@ -81,6 +89,8 @@ void main_loop_callback() {
 		}
 		target_ticks += (uint64_t)(1000000 / max_fps);
 	}
+#endif
+
 	if (os->main_loop_iterate()) {
 		emscripten_cancel_main_loop(); // Cancel current loop and set the cleanup one.
 		emscripten_set_main_loop(exit_callback, -1, false);