Add const references detected by clang-tidy

core/debugger/engine_debugger.cpp

@@ -162,7 +162,7 @@ void EngineDebugger::initialize(const String &p_uri, bool p_skip_breakpoints, Ve
 	singleton_script_debugger->set_skip_breakpoints(p_skip_breakpoints);
 
 	for (int i = 0; i < p_breakpoints.size(); i++) {
-		String bp = p_breakpoints[i];
+		const String &bp = p_breakpoints[i];
 		int sp = bp.rfind(":");
 		ERR_CONTINUE_MSG(sp == -1, "Invalid breakpoint: '" + bp + "', expected file:line format.");
 

core/input/input.cpp

@@ -1518,7 +1518,7 @@ void Input::add_joy_mapping(String p_mapping, bool p_update_existing) {
 	parse_mapping(p_mapping);
 	if (p_update_existing) {
 		Vector<String> entry = p_mapping.split(",");
-		String uid = entry[0];
+		const String &uid = entry[0];
 		for (KeyValue<int, Joypad> &E : joy_names) {
 			Joypad &joy = E.value;
 			if (joy.uid == uid) {

core/input/input_map.cpp

@@ -754,7 +754,7 @@ const HashMap<String, List<Ref<InputEvent>>> &InputMap::get_builtins_with_featur
 		String fullname = E.key;
 
 		Vector<String> split = fullname.split(".");
-		String name = split[0];
+		const String &name = split[0];
 		String override_for = split.size() > 1 ? split[1] : String();
 
 		if (!override_for.is_empty() && OS::get_singleton()->has_feature(override_for)) {
@@ -766,7 +766,7 @@ const HashMap<String, List<Ref<InputEvent>>> &InputMap::get_builtins_with_featur
 		String fullname = E.key;
 
 		Vector<String> split = fullname.split(".");
-		String name = split[0];
+		const String &name = split[0];
 		String override_for = split.size() > 1 ? split[1] : String();
 
 		if (builtins_with_overrides.has(name) && override_for.is_empty()) {

core/io/file_access_pack.cpp

@@ -491,7 +491,7 @@ PackedData::PackedDir *DirAccessPack::_find_dir(String p_dir) {
 	}
 
 	for (int i = 0; i < paths.size(); i++) {
-		String p = paths[i];
+		const String &p = paths[i];
 		if (p == ".") {
 			continue;
 		} else if (p == "..") {

core/io/http_client.cpp

@@ -73,7 +73,7 @@ String HTTPClient::query_string_from_dict(const Dictionary &p_dict) {
 	Array keys = p_dict.keys();
 	for (int i = 0; i < keys.size(); ++i) {
 		String encoded_key = String(keys[i]).uri_encode();
-		Variant value = p_dict[keys[i]];
+		const Variant &value = p_dict[keys[i]];
 		switch (value.get_type()) {
 			case Variant::ARRAY: {
 				// Repeat the key with every values

core/os/keyboard.cpp

@@ -410,7 +410,7 @@ Key find_keycode(const String &p_codestr) {
 		return keycode;
 	}
 
-	String last_part = code_parts[code_parts.size() - 1];
+	const String &last_part = code_parts[code_parts.size() - 1];
 	const _KeyCodeText *kct = &_keycodes[0];
 
 	while (kct->text) {
@@ -422,7 +422,7 @@ Key find_keycode(const String &p_codestr) {
 	}
 
 	for (int part = 0; part < code_parts.size() - 1; part++) {
-		String code_part = code_parts[part];
+		const String &code_part = code_parts[part];
 		if (code_part.nocasecmp_to(find_keycode_name(Key::SHIFT)) == 0) {
 			keycode |= KeyModifierMask::SHIFT;
 		} else if (code_part.nocasecmp_to(find_keycode_name(Key::CTRL)) == 0) {

core/string/ustring.cpp

@@ -4569,7 +4569,7 @@ bool String::is_valid_ip_address() const {
 	if (find(":") >= 0) {
 		Vector<String> ip = split(":");
 		for (int i = 0; i < ip.size(); i++) {
-			String n = ip[i];
+			const String &n = ip[i];
 			if (n.is_empty()) {
 				continue;
 			}
@@ -4591,7 +4591,7 @@ bool String::is_valid_ip_address() const {
 			return false;
 		}
 		for (int i = 0; i < ip.size(); i++) {
-			String n = ip[i];
+			const String &n = ip[i];
 			if (!n.is_valid_int()) {
 				return false;
 			}

drivers/gles3/shader_gles3.cpp

@@ -49,7 +49,7 @@ void ShaderGLES3::_add_stage(const char *p_code, StageType p_stage_type) {
 	String text;
 
 	for (int i = 0; i < lines.size(); i++) {
-		String l = lines[i];
+		const String &l = lines[i];
 		bool push_chunk = false;
 
 		StageTemplate::Chunk chunk;

drivers/gles3/storage/texture_storage.cpp

@@ -766,7 +766,7 @@ void TextureStorage::texture_2d_layered_initialize(RID p_texture, const Vector<R
 	ERR_FAIL_COND(p_layered_type == RS::TEXTURE_LAYERED_CUBEMAP && p_layers.size() != 6);
 	ERR_FAIL_COND_MSG(p_layered_type == RS::TEXTURE_LAYERED_CUBEMAP_ARRAY, "Cubemap Arrays are not supported in the GL Compatibility backend.");
 
-	Ref<Image> image = p_layers[0];
+	const Ref<Image> &image = p_layers[0];
 	{
 		int valid_width = 0;
 		int valid_height = 0;

editor/code_editor.cpp

@@ -1277,7 +1277,7 @@ void CodeTextEditor::move_lines_up() {
 
 		for (int j = 0; j < caret_groups[i].size(); j++) {
 			int c = caret_groups[i][j];
-			Vector<int> caret_parameters = caret_group_parameters[j];
+			const Vector<int> &caret_parameters = caret_group_parameters[j];
 			text_editor->set_caret_line(caret_parameters[4] - 1, c == 0, true, 0, c);
 			text_editor->set_caret_column(caret_parameters[5], c == 0, c);
 
@@ -1374,7 +1374,7 @@ void CodeTextEditor::move_lines_down() {
 
 		for (int j = 0; j < caret_groups[i].size(); j++) {
 			int c = caret_groups[i][j];
-			Vector<int> caret_parameters = caret_group_parameters[j];
+			const Vector<int> &caret_parameters = caret_group_parameters[j];
 			text_editor->set_caret_line(caret_parameters[4] + 1, c == 0, true, 0, c);
 			text_editor->set_caret_column(caret_parameters[5], c == 0, c);
 

editor/debugger/script_editor_debugger.cpp

@@ -1683,7 +1683,7 @@ void ScriptEditorDebugger::_item_menu_id_pressed(int p_option) {
 			// Parse back the `file:line @ method()` string.
 			const Vector<String> file_line_number = ci->get_text(1).split("@")[0].strip_edges().split(":");
 			ERR_FAIL_COND_MSG(file_line_number.size() < 2, "Incorrect C++ source stack trace file:line format (please report).");
-			const String file = file_line_number[0];
+			const String &file = file_line_number[0];
 			const int line_number = file_line_number[1].to_int();
 
 			// Construct a GitHub repository URL and open it in the user's default web browser.

editor/doc_tools.cpp

@@ -382,7 +382,7 @@ void DocTools::generate(BitField<GenerateFlags> p_flags) {
 				continue;
 			}
 
-			String cname = name;
+			const String &cname = name;
 			// Property setters and getters do not get exposed as individual methods.
 			HashSet<StringName> setters_getters;
 

editor/editor_build_profile.cpp

@@ -481,7 +481,7 @@ void EditorBuildProfileManager::_detect_classes() {
 			String l = f->get_line();
 			Vector<String> fields = l.split("::");
 			if (fields.size() == 4) {
-				String path = fields[0];
+				const String &path = fields[0];
 				DetectedFile df;
 				df.timestamp = fields[1].to_int();
 				df.md5 = fields[2];
@@ -597,7 +597,7 @@ void EditorBuildProfileManager::_fill_classes_from(TreeItem *p_parent, const Str
 	TreeItem *class_item = class_list->create_item(p_parent);
 	class_item->set_cell_mode(0, TreeItem::CELL_MODE_CHECK);
 	class_item->set_icon(0, EditorNode::get_singleton()->get_class_icon(p_class));
-	String text = p_class;
+	const String &text = p_class;
 
 	bool disabled = edited->is_class_disabled(p_class);
 	if (disabled) {

editor/editor_file_system.cpp

@@ -256,7 +256,7 @@ void EditorFileSystem::_scan_filesystem() {
 				if (l.begins_with("::")) {
 					Vector<String> split = l.split("::");
 					ERR_CONTINUE(split.size() != 3);
-					String name = split[1];
+					const String &name = split[1];
 
 					cpath = name;
 
@@ -289,7 +289,7 @@ void EditorFileSystem::_scan_filesystem() {
 					if (deps.length()) {
 						Vector<String> dp = deps.split("<>");
 						for (int i = 0; i < dp.size(); i++) {
-							String path = dp[i];
+							const String &path = dp[i];
 							fc.deps.push_back(path);
 						}
 					}

editor/editor_help.cpp

@@ -2867,10 +2867,10 @@ void EditorHelpTooltip::parse_tooltip(const String &p_text) {
 	PackedStringArray slices = p_text.split("|", true, 3);
 	ERR_FAIL_COND_MSG(slices.size() < 4, "Invalid tooltip formatting. The expect string should be formatted as 'type|class|property|args'.");
 
-	String type = slices[0];
+	const String &type = slices[0];
-	String class_name = slices[1];
+	const String &class_name = slices[1];
-	String property_name = slices[2];
+	const String &property_name = slices[2];
-	String property_args = slices[3];
+	const String &property_args = slices[3];
 
 	String title;
 	String description;

editor/editor_inspector.cpp

@@ -3018,7 +3018,7 @@ void EditorInspector::update_tree() {
 
 		Vector<String> components = path.split("/");
 		for (int i = 0; i < components.size(); i++) {
-			String component = components[i];
+			const String &component = components[i];
 			acc_path += (i > 0) ? "/" + component : component;
 
 			if (!vbox_per_path[root_vbox].has(acc_path)) {

editor/editor_interface.cpp

@@ -127,7 +127,7 @@ Vector<Ref<Texture2D>> EditorInterface::make_mesh_previews(const Vector<Ref<Mesh
 	Vector<Ref<Texture2D>> textures;
 
 	for (int i = 0; i < p_meshes.size(); i++) {
-		Ref<Mesh> mesh = p_meshes[i];
+		const Ref<Mesh> &mesh = p_meshes[i];
 		if (!mesh.is_valid()) {
 			textures.push_back(Ref<Texture2D>());
 			continue;

editor/editor_node.cpp

@@ -176,7 +176,7 @@ void EditorNode::disambiguate_filenames(const Vector<String> p_full_paths, Vecto
 	Vector<RBSet<int>> index_sets;
 	HashMap<String, int> scene_name_to_set_index;
 	for (int i = 0; i < r_filenames.size(); i++) {
-		String scene_name = r_filenames[i];
+		const String &scene_name = r_filenames[i];
 		if (!scene_name_to_set_index.has(scene_name)) {
 			index_sets.append(RBSet<int>());
 			scene_name_to_set_index.insert(r_filenames[i], index_sets.size() - 1);
@@ -232,7 +232,7 @@ void EditorNode::disambiguate_filenames(const Vector<String> p_full_paths, Vecto
 					if (E->get() == F) {
 						continue;
 					}
-					String other_scene_name = r_filenames[F];
+					const String &other_scene_name = r_filenames[F];
 					if (other_scene_name == scene_name) {
 						duplicate_found = true;
 						break;
@@ -4197,7 +4197,7 @@ void EditorNode::_quick_opened() {
 
 	bool open_scene_dialog = quick_open->get_base_type() == "PackedScene";
 	for (int i = 0; i < files.size(); i++) {
-		String res_path = files[i];
+		const String &res_path = files[i];
 		if (open_scene_dialog || ClassDB::is_parent_class(ResourceLoader::get_resource_type(res_path), "PackedScene")) {
 			open_request(res_path);
 		} else {
@@ -4595,8 +4595,8 @@ String EditorNode::_get_system_info() const {
 	}
 	graphics += rendering_device_name;
 	if (video_adapter_driver_info.size() == 2) { // This vector is always either of length 0 or 2.
-		String vad_name = video_adapter_driver_info[0];
+		const String &vad_name = video_adapter_driver_info[0];
-		String vad_version = video_adapter_driver_info[1]; // Version could be potentially empty on Linux/BSD.
+		const String &vad_version = video_adapter_driver_info[1]; // Version could be potentially empty on Linux/BSD.
 		if (!vad_version.is_empty()) {
 			graphics += vformat(" (%s; %s)", vad_name, vad_version);
 		} else {
@@ -5187,7 +5187,7 @@ void EditorNode::_load_docks_from_config(Ref<ConfigFile> p_layout, const String
 		Vector<String> names = String(p_layout->get_value(p_section, "dock_" + itos(i + 1))).split(",");
 
 		for (int j = names.size() - 1; j >= 0; j--) {
-			String name = names[j];
+			const String &name = names[j];
 
 			// FIXME: Find it, in a horribly inefficient way.
 			int atidx = -1;
@@ -6003,7 +6003,7 @@ void EditorNode::_add_dropped_files_recursive(const Vector<String> &p_files, Str
 	ERR_FAIL_COND(dir.is_null());
 
 	for (int i = 0; i < p_files.size(); i++) {
-		String from = p_files[i];
+		const String &from = p_files[i];
 		String to = to_path.path_join(from.get_file());
 
 		if (dir->dir_exists(from)) {

editor/editor_plugin_settings.cpp

@@ -64,7 +64,7 @@ void EditorPluginSettings::update_plugins() {
 	for (int i = 0; i < plugins.size(); i++) {
 		Ref<ConfigFile> cf;
 		cf.instantiate();
-		const String path = plugins[i];
+		const String &path = plugins[i];
 
 		Error err2 = cf->load(path);
 

editor/editor_properties_array_dict.cpp

@@ -468,7 +468,7 @@ bool EditorPropertyArray::_is_drop_valid(const Dictionary &p_drag_data) const {
 		Vector<String> files = drag_data["files"];
 
 		for (int i = 0; i < files.size(); i++) {
-			String file = files[i];
+			const String &file = files[i];
 			String ftype = EditorFileSystem::get_singleton()->get_file_type(file);
 
 			for (int j = 0; j < allowed_type.get_slice_count(","); j++) {
@@ -510,7 +510,7 @@ void EditorPropertyArray::drop_data_fw(const Point2 &p_point, const Variant &p_d
 
 		// Loop the file array and add to existing array.
 		for (int i = 0; i < files.size(); i++) {
-			String file = files[i];
+			const String &file = files[i];
 
 			Ref<Resource> res = ResourceLoader::load(file);
 			if (res.is_valid()) {

editor/export/editor_export_platform.cpp

@@ -456,7 +456,7 @@ void EditorExportPlatform::_edit_files_with_filter(Ref<DirAccess> &da, const Vec
 	da->list_dir_end();
 
 	for (int i = 0; i < dirs.size(); ++i) {
-		String dir = dirs[i];
+		const String &dir = dirs[i];
 		if (dir.begins_with(".")) {
 			continue;
 		}
@@ -1096,7 +1096,7 @@ Error EditorExportPlatform::export_project_files(const Ref<EditorExportPreset> &
 				Vector<String> fields = l.split("::");
 				if (fields.size() == 4) {
 					FileExportCache fec;
-					String path = fields[0];
+					const String &path = fields[0];
 					fec.source_md5 = fields[1].strip_edges();
 					fec.source_modified_time = fields[2].strip_edges().to_int();
 					fec.saved_path = fields[3];
@@ -1364,8 +1364,8 @@ Error EditorExportPlatform::export_project_files(const Ref<EditorExportPreset> &
 	if (path_remaps.size()) {
 		if (true) { //new remap mode, use always as it's friendlier with multiple .pck exports
 			for (int i = 0; i < path_remaps.size(); i += 2) {
-				String from = path_remaps[i];
+				const String &from = path_remaps[i];
-				String to = path_remaps[i + 1];
+				const String &to = path_remaps[i + 1];
 				String remap_file = "[remap]\n\npath=\"" + to.c_escape() + "\"\n";
 				CharString utf8 = remap_file.utf8();
 				Vector<uint8_t> new_file;

editor/filesystem_dock.cpp

@@ -388,7 +388,7 @@ void FileSystemDock::_update_tree(const Vector<String> &p_uncollapsed_paths, boo
 	const Color default_folder_color = get_theme_color(SNAME("folder_icon_color"), SNAME("FileDialog"));
 
 	for (int i = 0; i < favorite_paths.size(); i++) {
-		String favorite = favorite_paths[i];
+		const String &favorite = favorite_paths[i];
 		if (!favorite.begins_with("res://")) {
 			continue;
 		}
@@ -2172,7 +2172,7 @@ void FileSystemDock::_file_option(int p_option, const Vector<String> &p_selected
 			// Instantiate all selected scenes.
 			Vector<String> paths;
 			for (int i = 0; i < p_selected.size(); i++) {
-				String fpath = p_selected[i];
+				const String &fpath = p_selected[i];
 				if (EditorFileSystem::get_singleton()->get_file_type(fpath) == "PackedScene") {
 					paths.push_back(fpath);
 				}
@@ -2210,7 +2210,7 @@ void FileSystemDock::_file_option(int p_option, const Vector<String> &p_selected
 		case FILE_DEPENDENCIES: {
 			// Checkout the file dependencies.
 			if (!p_selected.is_empty()) {
-				String fpath = p_selected[0];
+				const String &fpath = p_selected[0];
 				deps_editor->edit(fpath);
 			}
 		} break;
@@ -2218,7 +2218,7 @@ void FileSystemDock::_file_option(int p_option, const Vector<String> &p_selected
 		case FILE_OWNERS: {
 			// Checkout the file owners.
 			if (!p_selected.is_empty()) {
-				String fpath = p_selected[0];
+				const String &fpath = p_selected[0];
 				owners_editor->show(fpath);
 			}
 		} break;
@@ -2228,7 +2228,7 @@ void FileSystemDock::_file_option(int p_option, const Vector<String> &p_selected
 			to_move.clear();
 			Vector<String> collapsed_paths = _remove_self_included_paths(p_selected);
 			for (int i = collapsed_paths.size() - 1; i >= 0; i--) {
-				String fpath = collapsed_paths[i];
+				const String &fpath = collapsed_paths[i];
 				if (fpath != "res://") {
 					to_move.push_back(FileOrFolder(fpath, !fpath.ends_with("/")));
 				}
@@ -2275,7 +2275,7 @@ void FileSystemDock::_file_option(int p_option, const Vector<String> &p_selected
 			Vector<String> collapsed_paths = _remove_self_included_paths(p_selected);
 
 			for (int i = 0; i < collapsed_paths.size(); i++) {
-				String fpath = collapsed_paths[i];
+				const String &fpath = collapsed_paths[i];
 				if (fpath != "res://") {
 					if (fpath.ends_with("/")) {
 						remove_folders.push_back(fpath);
@@ -2347,7 +2347,7 @@ void FileSystemDock::_file_option(int p_option, const Vector<String> &p_selected
 
 		case FILE_COPY_PATH: {
 			if (!p_selected.is_empty()) {
-				String fpath = p_selected[0];
+				const String &fpath = p_selected[0];
 				DisplayServer::get_singleton()->clipboard_set(fpath);
 			}
 		} break;
@@ -2859,7 +2859,7 @@ void FileSystemDock::_folder_color_index_pressed(int p_index, PopupMenu *p_menu)
 
 	// Update project settings with new folder colors.
 	for (int i = 0; i < selected.size(); i++) {
-		String fpath = selected[i];
+		const String &fpath = selected[i];
 
 		if (chosen_color_name) {
 			assigned_folder_colors[fpath] = chosen_color_name;
@@ -2890,7 +2890,7 @@ void FileSystemDock::_file_and_folders_fill_popup(PopupMenu *p_popup, Vector<Str
 	bool all_not_favorites = true;
 
 	for (int i = 0; i < p_paths.size(); i++) {
-		String fpath = p_paths[i];
+		const String &fpath = p_paths[i];
 		if (fpath.ends_with("/")) {
 			foldernames.push_back(fpath);
 			all_files = false;
@@ -3048,7 +3048,7 @@ void FileSystemDock::_file_and_folders_fill_popup(PopupMenu *p_popup, Vector<Str
 	}
 
 	if (p_paths.size() == 1) {
-		const String fpath = p_paths[0];
+		const String &fpath = p_paths[0];
 
 #if !defined(ANDROID_ENABLED) && !defined(WEB_ENABLED)
 		p_popup->add_separator();
@@ -3424,7 +3424,7 @@ void FileSystemDock::_update_import_dock() {
 	Vector<String> imports;
 	String import_type;
 	for (int i = 0; i < efiles.size(); i++) {
-		String fpath = efiles[i];
+		const String &fpath = efiles[i];
 		Ref<ConfigFile> cf;
 		cf.instantiate();
 		Error err = cf->load(fpath + ".import");

editor/gui/scene_tree_editor.cpp

@@ -728,7 +728,7 @@ bool SceneTreeEditor::_item_matches_all_terms(TreeItem *p_item, PackedStringArra
 	}
 
 	for (int i = 0; i < p_terms.size(); i++) {
-		String term = p_terms[i];
+		const String &term = p_terms[i];
 
 		// Recognize special filter.
 		if (term.contains(":") && !term.get_slicec(':', 0).is_empty()) {

editor/import/collada.cpp

@@ -1718,7 +1718,7 @@ void Collada::_parse_animation(XMLParser &p_parser) {
 
 	for (int i = 0; i < channel_sources.size(); i++) {
 		String source = _uri_to_id(channel_sources[i]);
-		String target = channel_targets[i];
+		const String &target = channel_targets[i];
 		ERR_CONTINUE(!samplers.has(source));
 		HashMap<String, String> &sampler = samplers[source];
 

editor/import/editor_import_collada.cpp

@@ -1151,7 +1151,7 @@ Error ColladaImport::_create_resources(Collada::Node *p_node, bool p_use_compres
 
 					ERR_FAIL_COND_V(skeletons.is_empty(), ERR_INVALID_DATA);
 
-					String skname = skeletons[0];
+					const String &skname = skeletons[0];
 					ERR_FAIL_COND_V(!node_map.has(skname), ERR_INVALID_DATA);
 					NodeMap nmsk = node_map[skname];
 					Skeleton3D *sk = Object::cast_to<Skeleton3D>(nmsk.node);
@@ -1205,7 +1205,7 @@ Error ColladaImport::_create_resources(Collada::Node *p_node, bool p_use_compres
 							valid = true;
 							Vector<String> names = morph->sources[target].sarray;
 							for (int i = 0; i < names.size(); i++) {
-								String meshid2 = names[i];
+								const String &meshid2 = names[i];
 								if (collada.state.mesh_data_map.has(meshid2)) {
 									Ref<ImporterMesh> mesh = Ref<ImporterMesh>(memnew(ImporterMesh));
 									const Collada::MeshData &meshdata = collada.state.mesh_data_map[meshid2];

editor/localization_editor.cpp

@@ -545,7 +545,7 @@ void LocalizationEditor::update_translations() {
 
 				PackedStringArray selected = remaps[keys[i]];
 				for (int j = 0; j < selected.size(); j++) {
-					String s2 = selected[j];
+					const String &s2 = selected[j];
 					int qp = s2.rfind(":");
 					String path = s2.substr(0, qp);
 					String locale = s2.substr(qp + 1, s2.length());

editor/plugins/control_editor_plugin.cpp

@@ -189,7 +189,7 @@ void EditorPropertyAnchorsPreset::setup(const Vector<String> &p_options) {
 		Vector<String> text_split = p_options[i].split(":");
 		int64_t current_val = text_split[1].to_int();
 
-		String option_name = text_split[0];
+		const String &option_name = text_split[0];
 		if (option_name.begins_with("Preset")) {
 			String preset_name = option_name.trim_prefix("Preset");
 			String humanized_name = preset_name.capitalize();

editor/plugins/resource_preloader_editor_plugin.cpp

@@ -50,7 +50,7 @@ void ResourcePreloaderEditor::_notification(int p_what) {
 
 void ResourcePreloaderEditor::_files_load_request(const Vector<String> &p_paths) {
 	for (int i = 0; i < p_paths.size(); i++) {
-		String path = p_paths[i];
+		const String &path = p_paths[i];
 
 		Ref<Resource> resource;
 		resource = ResourceLoader::load(path);

editor/plugins/script_editor_plugin.cpp

@@ -2963,7 +2963,7 @@ bool ScriptEditor::can_drop_data_fw(const Point2 &p_point, const Variant &p_data
 		}
 
 		for (int i = 0; i < files.size(); i++) {
-			String file = files[i];
+			const String &file = files[i];
 			if (file.is_empty() || !FileAccess::exists(file)) {
 				continue;
 			}
@@ -3043,7 +3043,7 @@ void ScriptEditor::drop_data_fw(const Point2 &p_point, const Variant &p_data, Co
 		}
 		int num_tabs_before = tab_container->get_tab_count();
 		for (int i = 0; i < files.size(); i++) {
-			String file = files[i];
+			const String &file = files[i];
 			if (file.is_empty() || !FileAccess::exists(file)) {
 				continue;
 			}

editor/plugins/script_text_editor.cpp

@@ -1409,7 +1409,7 @@ void ScriptTextEditor::_edit_option(int p_op) {
 				PackedStringArray results;
 
 				for (int i = 0; i < lines.size(); i++) {
-					String line = lines[i];
+					const String &line = lines[i];
 					String whitespace = line.substr(0, line.size() - line.strip_edges(true, false).size()); // Extract the whitespace at the beginning.
 					if (expression.parse(line) == OK) {
 						Variant result = expression.execute(Array(), Variant(), false, true);

editor/plugins/shader_editor_plugin.cpp

@@ -517,7 +517,7 @@ bool ShaderEditorPlugin::can_drop_data_fw(const Point2 &p_point, const Variant &
 		}
 
 		for (int i = 0; i < files.size(); i++) {
-			String file = files[i];
+			const String &file = files[i];
 			if (ResourceLoader::exists(file, "Shader")) {
 				Ref<Shader> shader = ResourceLoader::load(file);
 				if (shader.is_valid()) {
@@ -558,7 +558,7 @@ void ShaderEditorPlugin::drop_data_fw(const Point2 &p_point, const Variant &p_da
 		Vector<String> files = d["files"];
 
 		for (int i = 0; i < files.size(); i++) {
-			String file = files[i];
+			const String &file = files[i];
 			Ref<Resource> res;
 			if (ResourceLoader::exists(file, "Shader") || ResourceLoader::exists(file, "ShaderInclude")) {
 				res = ResourceLoader::load(file);

editor/plugins/sprite_frames_editor_plugin.cpp

@@ -1425,7 +1425,7 @@ bool SpriteFramesEditor::can_drop_data_fw(const Point2 &p_point, const Variant &
 		}
 
 		for (int i = 0; i < files.size(); i++) {
-			String f = files[i];
+			const String &f = files[i];
 			String ftype = EditorFileSystem::get_singleton()->get_file_type(f);
 
 			if (!ClassDB::is_parent_class(ftype, "Texture2D")) {

editor/plugins/tiles/atlas_merging_dialog.cpp

@@ -52,7 +52,7 @@ void AtlasMergingDialog::_generate_merged(Vector<Ref<TileSetAtlasSource>> p_atla
 		// Compute the new texture region size.
 		Vector2i new_texture_region_size;
 		for (int source_index = 0; source_index < p_atlas_sources.size(); source_index++) {
-			Ref<TileSetAtlasSource> atlas_source = p_atlas_sources[source_index];
+			const Ref<TileSetAtlasSource> &atlas_source = p_atlas_sources[source_index];
 			new_texture_region_size = new_texture_region_size.max(atlas_source->get_texture_region_size());
 		}
 
@@ -60,7 +60,7 @@ void AtlasMergingDialog::_generate_merged(Vector<Ref<TileSetAtlasSource>> p_atla
 		Vector2i atlas_offset;
 		int line_height = 0;
 		for (int source_index = 0; source_index < p_atlas_sources.size(); source_index++) {
-			Ref<TileSetAtlasSource> atlas_source = p_atlas_sources[source_index];
+			const Ref<TileSetAtlasSource> &atlas_source = p_atlas_sources[source_index];
 			Ref<Image> input_image = atlas_source->get_texture()->get_image();
 			if (input_image->get_format() != Image::FORMAT_RGBA8) {
 				input_image->convert(Image::FORMAT_RGBA8);
@@ -111,7 +111,7 @@ void AtlasMergingDialog::_generate_merged(Vector<Ref<TileSetAtlasSource>> p_atla
 
 		// Copy the tiles to the merged TileSetAtlasSource.
 		for (int source_index = 0; source_index < p_atlas_sources.size(); source_index++) {
-			Ref<TileSetAtlasSource> atlas_source = p_atlas_sources[source_index];
+			const Ref<TileSetAtlasSource> &atlas_source = p_atlas_sources[source_index];
 			for (KeyValue<Vector2i, Vector2i> tile_mapping : merged_mapping[source_index]) {
 				// Create tiles and alternatives, then copy their properties.
 				for (int alternative_index = 0; alternative_index < atlas_source->get_alternative_tiles_count(tile_mapping.key); alternative_index++) {

editor/pot_generator.cpp

@@ -69,7 +69,7 @@ void POTGenerator::generate_pot(const String &p_file) {
 	for (int i = 0; i < files.size(); i++) {
 		Vector<String> msgids;
 		Vector<Vector<String>> msgids_context_plural;
-		String file_path = files[i];
+		const String &file_path = files[i];
 		String file_extension = file_path.get_extension();
 
 		if (EditorTranslationParser::get_singleton()->can_parse(file_extension)) {
@@ -80,7 +80,7 @@ void POTGenerator::generate_pot(const String &p_file) {
 		}
 
 		for (int j = 0; j < msgids_context_plural.size(); j++) {
-			Vector<String> entry = msgids_context_plural[j];
+			const Vector<String> &entry = msgids_context_plural[j];
 			_add_new_msgid(entry[0], entry[1], entry[2], file_path);
 		}
 		for (int j = 0; j < msgids.size(); j++) {

editor/project_converter_3_to_4.cpp

@@ -561,7 +561,7 @@ bool ProjectConverter3To4::validate_conversion() {
 
 	// Check file by file.
 	for (int i = 0; i < collected_files.size(); i++) {
-		String file_name = collected_files[i];
+		const String &file_name = collected_files[i];
 		Vector<String> lines;
 		uint32_t ignored_lines = 0;
 		uint64_t file_size = 0;
@@ -2732,7 +2732,7 @@ void ProjectConverter3To4::rename_joypad_buttons_and_axes(Vector<SourceLine> &so
 			for (int i = 0; i < reg_match.size(); ++i) {
 				Ref<RegExMatch> match = reg_match[i];
 				PackedStringArray strings = match->get_strings();
-				String button_index_entry = strings[0];
+				const String &button_index_entry = strings[0];
 				int button_index_value = strings[1].to_int();
 				if (button_index_value == 6) { // L2 and R2 are mapped to joypad axes in Godot 4.
 					line = line.replace("InputEventJoypadButton", "InputEventJoypadMotion");
@@ -2741,7 +2741,7 @@ void ProjectConverter3To4::rename_joypad_buttons_and_axes(Vector<SourceLine> &so
 					line = line.replace("InputEventJoypadButton", "InputEventJoypadMotion");
 					line = line.replace(button_index_entry, ",\"axis\":5,\"axis_value\":1.0");
 				} else if (button_index_value < 22) { // There are no mappings for indexes greater than 22 in both Godot 3 & 4.
-					String pressure_and_pressed_properties = strings[2];
+					const String &pressure_and_pressed_properties = strings[2];
 					line = line.replace(button_index_entry, ",\"button_index\":" + String::num_int64(reg_container.joypad_button_mappings[button_index_value]) + "," + pressure_and_pressed_properties);
 				}
 			}
@@ -2750,7 +2750,7 @@ void ProjectConverter3To4::rename_joypad_buttons_and_axes(Vector<SourceLine> &so
 			for (int i = 0; i < reg_match.size(); ++i) {
 				Ref<RegExMatch> match = reg_match[i];
 				PackedStringArray strings = match->get_strings();
-				String axis_entry = strings[0];
+				const String &axis_entry = strings[0];
 				int axis_value = strings[1].to_int();
 				if (axis_value == 6) {
 					line = line.replace(axis_entry, ",\"axis\":4");
@@ -2772,7 +2772,7 @@ Vector<String> ProjectConverter3To4::check_for_rename_joypad_buttons_and_axes(Ve
 			for (int i = 0; i < reg_match.size(); ++i) {
 				Ref<RegExMatch> match = reg_match[i];
 				PackedStringArray strings = match->get_strings();
-				String button_index_entry = strings[0];
+				const String &button_index_entry = strings[0];
 				int button_index_value = strings[1].to_int();
 				if (button_index_value == 6) { // L2 and R2 are mapped to joypad axes in Godot 4.
 					found_renames.append(line_formatter(current_line, "InputEventJoypadButton", "InputEventJoypadMotion", line));
@@ -2789,7 +2789,7 @@ Vector<String> ProjectConverter3To4::check_for_rename_joypad_buttons_and_axes(Ve
 			for (int i = 0; i < reg_match.size(); ++i) {
 				Ref<RegExMatch> match = reg_match[i];
 				PackedStringArray strings = match->get_strings();
-				String axis_entry = strings[0];
+				const String &axis_entry = strings[0];
 				int axis_value = strings[1].to_int();
 				if (axis_value == 6) {
 					found_renames.append(line_formatter(current_line, axis_entry, ",\"axis\":4", line));

editor/project_manager.cpp

@@ -2660,7 +2660,7 @@ void ProjectManager::_files_dropped(PackedStringArray p_files) {
 	HashSet<String> folders_set;
 	Ref<DirAccess> da = DirAccess::create(DirAccess::ACCESS_FILESYSTEM);
 	for (int i = 0; i < p_files.size(); i++) {
-		String file = p_files[i];
+		const String &file = p_files[i];
 		folders_set.insert(da->dir_exists(file) ? file : file.get_base_dir());
 	}
 	if (folders_set.size() > 0) {
@@ -3058,7 +3058,7 @@ ProjectManager::ProjectManager() {
 		language_btn->set_text(current_lang);
 
 		for (int i = 0; i < editor_languages.size(); i++) {
-			String lang = editor_languages[i];
+			const String &lang = editor_languages[i];
 			String lang_name = TranslationServer::get_singleton()->get_locale_name(lang);
 			language_btn->add_item(vformat("[%s] %s", lang, lang_name), i);
 			language_btn->set_item_metadata(i, lang);

editor/project_settings_editor.cpp

@@ -171,7 +171,7 @@ void ProjectSettingsEditor::_feature_selected(int p_index) {
 void ProjectSettingsEditor::_update_property_box() {
 	const String setting = _get_setting_name();
 	const Vector<String> t = setting.split(".", true, 1);
-	const String name = t[0];
+	const String &name = t[0];
 	const String feature = (t.size() == 2) ? t[1] : "";
 	bool feature_invalid = (t.size() == 2) && (t[1].is_empty());
 

editor/scene_tree_dock.cpp

@@ -2932,7 +2932,7 @@ void SceneTreeDock::_files_dropped(Vector<String> p_files, NodePath p_to, int p_
 		_normalize_drop(node, to_pos, p_type);
 		_perform_instantiate_scenes(p_files, node, to_pos);
 	} else {
-		String res_path = p_files[0];
+		const String &res_path = p_files[0];
 		StringName res_type = EditorFileSystem::get_singleton()->get_file_type(res_path);
 		List<String> valid_properties;
 

modules/gdscript/gdscript_editor.cpp

@@ -620,9 +620,9 @@ static String _trim_parent_class(const String &p_class, const String &p_base_cla
 	}
 	Vector<String> names = p_class.split(".", false, 1);
 	if (names.size() == 2) {
-		String first = names[0];
+		const String &first = names[0];
-		String rest = names[1];
 		if (ClassDB::class_exists(p_base_class) && ClassDB::class_exists(first) && ClassDB::is_parent_class(p_base_class, first)) {
+			const String &rest = names[1];
 			return rest;
 		}
 	}

modules/gdscript/gdscript_parser.cpp

@@ -625,7 +625,7 @@ GDScriptParser::ClassNode *GDScriptParser::find_class(const String &p_qualified_
 
 	// Starts at index 1 because index 0 was handled above.
 	for (int i = 1; result != nullptr && i < class_names.size(); i++) {
-		String current_name = class_names[i];
+		const String &current_name = class_names[i];
 		GDScriptParser::ClassNode *next = nullptr;
 		if (result->has_member(current_name)) {
 			GDScriptParser::ClassNode::Member member = result->get_member(current_name);

modules/gltf/gltf_document.cpp

@@ -6151,9 +6151,9 @@ T GLTFDocument::_interpolate_track(const Vector<real_t> &p_times, const Vector<T
 
 			const float c = (p_time - p_times[idx]) / (p_times[idx + 1] - p_times[idx]);
 
-			const T from = p_values[idx * 3 + 1];
+			const T &from = p_values[idx * 3 + 1];
 			const T c1 = from + p_values[idx * 3 + 2];
-			const T to = p_values[idx * 3 + 4];
+			const T &to = p_values[idx * 3 + 4];
 			const T c2 = to + p_values[idx * 3 + 3];
 
 			return interp.bezier(from, c1, c2, to, c);
@@ -7052,9 +7052,9 @@ void GLTFDocument::_convert_animation(Ref<GLTFState> p_state, AnimationPlayer *p
 		} else if (String(final_track_path).contains(":")) {
 			//Process skeleton
 			const Vector<String> node_suffix = String(final_track_path).split(":");
-			const String node = node_suffix[0];
+			const String &node = node_suffix[0];
 			const NodePath node_path = node;
-			const String suffix = node_suffix[1];
+			const String &suffix = node_suffix[1];
 			Node *godot_node = animation_base_node->get_node_or_null(node_path);
 			if (!godot_node) {
 				continue;

modules/openxr/editor/openxr_select_interaction_profile_dialog.cpp

@@ -77,7 +77,7 @@ void OpenXRSelectInteractionProfileDialog::open(PackedStringArray p_do_not_inclu
 	// in with the new
 	PackedStringArray interaction_profiles = OpenXRInteractionProfileMetadata::get_singleton()->get_interaction_profile_paths();
 	for (int i = 0; i < interaction_profiles.size(); i++) {
-		String path = interaction_profiles[i];
+		const String &path = interaction_profiles[i];
 		if (!p_do_not_include.has(path)) {
 			Button *ip_button = memnew(Button);
 			ip_button->set_flat(true);

platform/android/export/export_plugin.cpp

@@ -1111,7 +1111,7 @@ void EditorExportPlatformAndroid::_fix_manifest(const Ref<EditorExportPreset> &p
 						}
 
 						for (int i = 0; i < feature_names.size(); i++) {
-							String feature_name = feature_names[i];
+							const String &feature_name = feature_names[i];
 							bool feature_required = feature_required_list[i];
 							int feature_version = feature_versions[i];
 							bool has_version_attribute = feature_version != -1;

platform/ios/export/export_plugin.cpp

@@ -1226,7 +1226,7 @@ Error EditorExportPlatformIOS::_copy_asset(const String &p_out_dir, const String
 
 Error EditorExportPlatformIOS::_export_additional_assets(const String &p_out_dir, const Vector<String> &p_assets, bool p_is_framework, bool p_should_embed, Vector<IOSExportAsset> &r_exported_assets) {
 	for (int f_idx = 0; f_idx < p_assets.size(); ++f_idx) {
-		String asset = p_assets[f_idx];
+		const String &asset = p_assets[f_idx];
 		if (asset.begins_with("res://")) {
 			Error err = _copy_asset(p_out_dir, asset, nullptr, p_is_framework, p_should_embed, r_exported_assets);
 			ERR_FAIL_COND_V(err != OK, err);

platform/linuxbsd/freedesktop_portal_desktop.cpp

@@ -162,7 +162,7 @@ void FreeDesktopPortalDesktop::append_dbus_dict_filters(DBusMessageIter *p_iter,
 		append_dbus_string(&struct_iter, p_filter_names[i]);
 
 		dbus_message_iter_open_container(&struct_iter, DBUS_TYPE_ARRAY, "(us)", &array_iter);
-		String flt = p_filter_exts[i];
+		const String &flt = p_filter_exts[i];
 		int filter_slice_count = flt.get_slice_count(",");
 		for (int j = 0; j < filter_slice_count; j++) {
 			dbus_message_iter_open_container(&array_iter, DBUS_TYPE_STRUCT, nullptr, &array_struct_iter);

platform/linuxbsd/os_linuxbsd.cpp

@@ -316,7 +316,7 @@ Vector<String> OS_LinuxBSD::get_video_adapter_driver_info() const {
 			continue;
 		}
 		String device_class = columns[1].trim_suffix(":");
-		String vendor_device_id_mapping = columns[2];
+		const String &vendor_device_id_mapping = columns[2];
 
 #ifdef MODULE_REGEX_ENABLED
 		if (regex_id_format.search(vendor_device_id_mapping).is_null()) {

scene/gui/file_dialog.cpp

@@ -89,7 +89,7 @@ void FileDialog::set_visible(bool p_visible) {
 void FileDialog::_native_dialog_cb(bool p_ok, const Vector<String> &p_files, int p_filter) {
 	if (p_ok) {
 		if (p_files.size() > 0) {
-			String f = p_files[0];
+			const String &f = p_files[0];
 			if (mode == FILE_MODE_OPEN_FILES) {
 				emit_signal(SNAME("files_selected"), p_files);
 			} else {

scene/gui/graph_edit_arranger.cpp

@@ -287,13 +287,13 @@ Vector<StringName> GraphEditArranger::_split(const Vector<StringName> &r_layer,
 		return Vector<StringName>();
 	}
 
-	StringName p = r_layer[Math::random(0, r_layer.size() - 1)];
+	const StringName &p = r_layer[Math::random(0, r_layer.size() - 1)];
 	Vector<StringName> left;
 	Vector<StringName> right;
 
 	for (int i = 0; i < r_layer.size(); i++) {
 		if (p != r_layer[i]) {
-			StringName q = r_layer[i];
+			const StringName &q = r_layer[i];
 			int cross_pq = r_crossings[p][q];
 			int cross_qp = r_crossings[q][p];
 			if (cross_pq > cross_qp) {
@@ -326,9 +326,9 @@ void GraphEditArranger::_horizontal_alignment(Dictionary &r_root, Dictionary &r_
 
 		for (int j = 0; j < lower_layer.size(); j++) {
 			Vector<Pair<int, StringName>> up;
-			StringName current_node = lower_layer[j];
+			const StringName &current_node = lower_layer[j];
 			for (int k = 0; k < upper_layer.size(); k++) {
-				StringName adjacent_neighbour = upper_layer[k];
+				const StringName &adjacent_neighbour = upper_layer[k];
 				if (r_upper_neighbours[current_node].has(adjacent_neighbour)) {
 					up.push_back(Pair<int, StringName>(k, adjacent_neighbour));
 				}
@@ -360,12 +360,12 @@ void GraphEditArranger::_crossing_minimisation(HashMap<int, Vector<StringName>>
 		HashMap<StringName, Dictionary> c;
 
 		for (int j = 0; j < lower_layer.size(); j++) {
-			StringName p = lower_layer[j];
+			const StringName &p = lower_layer[j];
 			Dictionary d;
 
 			for (int k = 0; k < lower_layer.size(); k++) {
 				unsigned int crossings = 0;
-				StringName q = lower_layer[k];
+				const StringName &q = lower_layer[k];
 
 				if (j != k) {
 					for (int h = 1; h < upper_layer.size(); h++) {

scene/gui/option_button.cpp

@@ -159,7 +159,7 @@ void OptionButton::_notification(int p_what) {
 bool OptionButton::_set(const StringName &p_name, const Variant &p_value) {
 	Vector<String> components = String(p_name).split("/", true, 2);
 	if (components.size() >= 2 && components[0] == "popup") {
-		String property = components[2];
+		const String &property = components[2];
 		if (property != "text" && property != "icon" && property != "id" && property != "disabled" && property != "separator") {
 			return false;
 		}
@@ -186,7 +186,7 @@ bool OptionButton::_set(const StringName &p_name, const Variant &p_value) {
 bool OptionButton::_get(const StringName &p_name, Variant &r_ret) const {
 	Vector<String> components = String(p_name).split("/", true, 2);
 	if (components.size() >= 2 && components[0] == "popup") {
-		String property = components[2];
+		const String &property = components[2];
 		if (property != "text" && property != "icon" && property != "id" && property != "disabled" && property != "separator") {
 			return false;
 		}

scene/gui/popup_menu.cpp

@@ -2483,7 +2483,7 @@ bool PopupMenu::_set(const StringName &p_name, const Variant &p_value) {
 	Vector<String> components = String(p_name).split("/", true, 2);
 	if (components.size() >= 2 && components[0].begins_with("item_") && components[0].trim_prefix("item_").is_valid_int()) {
 		int item_index = components[0].trim_prefix("item_").to_int();
-		String property = components[1];
+		const String &property = components[1];
 		if (property == "text") {
 			set_item_text(item_index, p_value);
 			return true;
@@ -2562,7 +2562,7 @@ bool PopupMenu::_get(const StringName &p_name, Variant &r_ret) const {
 	Vector<String> components = String(p_name).split("/", true, 2);
 	if (components.size() >= 2 && components[0].begins_with("item_") && components[0].trim_prefix("item_").is_valid_int()) {
 		int item_index = components[0].trim_prefix("item_").to_int();
-		String property = components[1];
+		const String &property = components[1];
 		if (property == "text") {
 			r_ret = get_item_text(item_index);
 			return true;

scene/gui/rich_text_label.cpp

@@ -4532,7 +4532,7 @@ void RichTextLabel::append_text(const String &p_bbcode) {
 
 				if (subtag_a.size() == 2) {
 					if (subtag_a[0] == "font" || subtag_a[0] == "f") {
-						String fnt = subtag_a[1];
+						const String &fnt = subtag_a[1];
 						Ref<Font> font = ResourceLoader::load(fnt, "Font");
 						if (font.is_valid()) {
 							f = font;
@@ -4776,7 +4776,7 @@ void RichTextLabel::append_text(const String &p_bbcode) {
 
 				if (subtag_a.size() == 2) {
 					if (subtag_a[0] == "name" || subtag_a[0] == "n") {
-						String fnt = subtag_a[1];
+						const String &fnt = subtag_a[1];
 						Ref<Font> font_data = ResourceLoader::load(fnt, "Font");
 						if (font_data.is_valid()) {
 							font = font_data;

scene/gui/tab_bar.cpp

@@ -1657,7 +1657,7 @@ bool TabBar::_set(const StringName &p_name, const Variant &p_value) {
 	Vector<String> components = String(p_name).split("/", true, 2);
 	if (components.size() >= 2 && components[0].begins_with("tab_") && components[0].trim_prefix("tab_").is_valid_int()) {
 		int tab_index = components[0].trim_prefix("tab_").to_int();
-		String property = components[1];
+		const String &property = components[1];
 		if (property == "title") {
 			set_tab_title(tab_index, p_value);
 			return true;
@@ -1676,7 +1676,7 @@ bool TabBar::_get(const StringName &p_name, Variant &r_ret) const {
 	Vector<String> components = String(p_name).split("/", true, 2);
 	if (components.size() >= 2 && components[0].begins_with("tab_") && components[0].trim_prefix("tab_").is_valid_int()) {
 		int tab_index = components[0].trim_prefix("tab_").to_int();
-		String property = components[1];
+		const String &property = components[1];
 		if (property == "title") {
 			r_ret = get_tab_title(tab_index);
 			return true;

scene/resources/curve.cpp

@@ -527,7 +527,7 @@ bool Curve::_set(const StringName &p_name, const Variant &p_value) {
 	Vector<String> components = String(p_name).split("/", true, 2);
 	if (components.size() >= 2 && components[0].begins_with("point_") && components[0].trim_prefix("point_").is_valid_int()) {
 		int point_index = components[0].trim_prefix("point_").to_int();
-		String property = components[1];
+		const String &property = components[1];
 		if (property == "position") {
 			Vector2 position = p_value.operator Vector2();
 			set_point_offset(point_index, position.x);
@@ -556,7 +556,7 @@ bool Curve::_get(const StringName &p_name, Variant &r_ret) const {
 	Vector<String> components = String(p_name).split("/", true, 2);
 	if (components.size() >= 2 && components[0].begins_with("point_") && components[0].trim_prefix("point_").is_valid_int()) {
 		int point_index = components[0].trim_prefix("point_").to_int();
-		String property = components[1];
+		const String &property = components[1];
 		if (property == "position") {
 			r_ret = get_point_position(point_index);
 			return true;
@@ -1255,7 +1255,7 @@ bool Curve2D::_set(const StringName &p_name, const Variant &p_value) {
 	Vector<String> components = String(p_name).split("/", true, 2);
 	if (components.size() >= 2 && components[0].begins_with("point_") && components[0].trim_prefix("point_").is_valid_int()) {
 		int point_index = components[0].trim_prefix("point_").to_int();
-		String property = components[1];
+		const String &property = components[1];
 		if (property == "position") {
 			set_point_position(point_index, p_value);
 			return true;
@@ -1274,7 +1274,7 @@ bool Curve2D::_get(const StringName &p_name, Variant &r_ret) const {
 	Vector<String> components = String(p_name).split("/", true, 2);
 	if (components.size() >= 2 && components[0].begins_with("point_") && components[0].trim_prefix("point_").is_valid_int()) {
 		int point_index = components[0].trim_prefix("point_").to_int();
-		String property = components[1];
+		const String &property = components[1];
 		if (property == "position") {
 			r_ret = get_point_position(point_index);
 			return true;
@@ -2220,7 +2220,7 @@ bool Curve3D::_set(const StringName &p_name, const Variant &p_value) {
 	Vector<String> components = String(p_name).split("/", true, 2);
 	if (components.size() >= 2 && components[0].begins_with("point_") && components[0].trim_prefix("point_").is_valid_int()) {
 		int point_index = components[0].trim_prefix("point_").to_int();
-		String property = components[1];
+		const String &property = components[1];
 		if (property == "position") {
 			set_point_position(point_index, p_value);
 			return true;
@@ -2242,7 +2242,7 @@ bool Curve3D::_get(const StringName &p_name, Variant &r_ret) const {
 	Vector<String> components = String(p_name).split("/", true, 2);
 	if (components.size() >= 2 && components[0].begins_with("point_") && components[0].trim_prefix("point_").is_valid_int()) {
 		int point_index = components[0].trim_prefix("point_").to_int();
-		String property = components[1];
+		const String &property = components[1];
 		if (property == "position") {
 			r_ret = get_point_position(point_index);
 			return true;

scene/resources/font.cpp

@@ -1118,11 +1118,11 @@ bool FontFile::_set(const StringName &p_name, const Variant &p_value) {
 #endif // DISABLE_DEPRECATED
 
 	if (tokens.size() == 2 && tokens[0] == "language_support_override") {
-		String lang_code = tokens[1];
+		const String &lang_code = tokens[1];
 		set_language_support_override(lang_code, p_value);
 		return true;
 	} else if (tokens.size() == 2 && tokens[0] == "script_support_override") {
-		String script_code = tokens[1];
+		const String &script_code = tokens[1];
 		set_script_support_override(script_code, p_value);
 		return true;
 	} else if (tokens.size() >= 3 && tokens[0] == "cache") {
@@ -1209,11 +1209,11 @@ bool FontFile::_set(const StringName &p_name, const Variant &p_value) {
 bool FontFile::_get(const StringName &p_name, Variant &r_ret) const {
 	Vector<String> tokens = p_name.operator String().split("/");
 	if (tokens.size() == 2 && tokens[0] == "language_support_override") {
-		String lang_code = tokens[1];
+		const String &lang_code = tokens[1];
 		r_ret = get_language_support_override(lang_code);
 		return true;
 	} else if (tokens.size() == 2 && tokens[0] == "script_support_override") {
-		String script_code = tokens[1];
+		const String &script_code = tokens[1];
 		r_ret = get_script_support_override(script_code);
 		return true;
 	} else if (tokens.size() >= 3 && tokens[0] == "cache") {

servers/rendering/renderer_rd/shader_rd.cpp

@@ -45,7 +45,7 @@ void ShaderRD::_add_stage(const char *p_code, StageType p_stage_type) {
 	String text;
 
 	for (int i = 0; i < lines.size(); i++) {
-		String l = lines[i];
+		const String &l = lines[i];
 		bool push_chunk = false;
 
 		StageTemplate::Chunk chunk;

servers/rendering/shader_compiler.cpp

@@ -543,7 +543,7 @@ String ShaderCompiler::_dump_node_code(const SL::Node *p_node, int p_level, Gene
 			uniform_names.sort_custom<StringName::AlphCompare>(); //ensure order is deterministic so the same shader is always produced
 
 			for (int k = 0; k < uniform_names.size(); k++) {
-				StringName uniform_name = uniform_names[k];
+				const StringName &uniform_name = uniform_names[k];
 				const SL::ShaderNode::Uniform &uniform = pnode->uniforms[uniform_name];
 
 				String ucode;
@@ -670,7 +670,7 @@ String ShaderCompiler::_dump_node_code(const SL::Node *p_node, int p_level, Gene
 			varying_names.sort_custom<StringName::AlphCompare>(); //ensure order is deterministic so the same shader is always produced
 
 			for (int k = 0; k < varying_names.size(); k++) {
-				StringName varying_name = varying_names[k];
+				const StringName &varying_name = varying_names[k];
 				const SL::ShaderNode::Varying &varying = pnode->varyings[varying_name];
 
 				if (varying.stage == SL::ShaderNode::Varying::STAGE_FRAGMENT_TO_LIGHT || varying.stage == SL::ShaderNode::Varying::STAGE_FRAGMENT) {

servers/rendering_server.cpp

@@ -103,7 +103,7 @@ PackedInt64Array RenderingServer::_instances_cull_convex_bind(const TypedArray<P
 	}
 	Vector<Plane> planes;
 	for (int i = 0; i < p_convex.size(); ++i) {
-		Variant v = p_convex[i];
+		const Variant &v = p_convex[i];
 		ERR_FAIL_COND_V(v.get_type() != Variant::PLANE, PackedInt64Array());
 		planes.push_back(v);
 	}