diff --git a/Cargo.toml b/Cargo.toml
index 0f7eac6..98959cd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,2 @@
 [workspace]
 members = ["instant-distance", "instant-distance-py"]
-
-[profile.bench]
-debug = true
diff --git a/instant-distance/Cargo.toml b/instant-distance/Cargo.toml
index fb678b2..13008de 100644
--- a/instant-distance/Cargo.toml
+++ b/instant-distance/Cargo.toml
@@ -20,7 +20,7 @@ num_cpus = "1.13"
 ordered-float = "2.0"
 parking_lot = "0.11"
 rand = { version = "0.8", features = ["small_rng"] }
-rayon = "1.5"
+#rayon = "1.5"
 serde = { version = "1.0.118", features = ["derive"], optional = true }
 serde-big-array = { version = "0.3.1", optional = true }
 
diff --git a/instant-distance/benches/all.rs b/instant-distance/benches/all.rs
index 60b422b..78a0ecf 100644
--- a/instant-distance/benches/all.rs
+++ b/instant-distance/benches/all.rs
@@ -1,5 +1,5 @@
 use bencher::{benchmark_group, benchmark_main, Bencher};
-use rand::rngs::{StdRng, ThreadRng};
+use rand::rngs::StdRng; //, ThreadRng};
 use rand::{Rng, SeedableRng};
 
 use instant_distance::Builder;
@@ -8,14 +8,18 @@ benchmark_main!(benches);
 benchmark_group!(benches, build_heuristic);
 
 fn build_heuristic(bench: &mut Bencher) {
-    let seed = ThreadRng::default().gen::<u64>();
-    let mut rng = StdRng::seed_from_u64(seed);
-    let points = (0..1024)
+    //let seed = dbg!(ThreadRng::default().gen::<u64>());
+    let mut rng = StdRng::seed_from_u64(11823281459843198809); //seed);
+    let points = (0..512)
         .into_iter()
         .map(|_| Point(rng.gen(), rng.gen()))
         .collect::<Vec<_>>();
 
-    bench.iter(|| Builder::default().seed(seed).build_hnsw(points.clone()))
+    bench.iter(|| {
+        Builder::default()
+            .seed(11823281459843198809)
+            .build_hnsw(points.clone())
+    })
 }
 
 /*
diff --git a/instant-distance/src/lib.rs b/instant-distance/src/lib.rs
index c1f39f5..54d58be 100644
--- a/instant-distance/src/lib.rs
+++ b/instant-distance/src/lib.rs
@@ -10,7 +10,7 @@ use ordered_float::OrderedFloat;
 use parking_lot::{Mutex, RwLock};
 use rand::rngs::SmallRng;
 use rand::{Rng, SeedableRng};
-use rayon::iter::{IndexedParallelIterator, IntoParallelIterator, ParallelIterator};
+//use rayon::iter::{IndexedParallelIterator, IntoParallelIterator, ParallelIterator};
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
 
@@ -291,7 +291,7 @@ where
             }
 
             let end = range.end;
-            nodes[range].into_par_iter().for_each(|(_, pid)| {
+            nodes[range].into_iter().for_each(|(_, pid)| {
                 let node = zero.as_slice()[*pid].write();
                 let (mut search, mut insertion) = pool.pop();
                 let point = &points.as_slice()[*pid];
@@ -337,11 +337,10 @@ where
             // For layers above the zero layer, make a copy of the current state of the zero layer
             // with `nearest` truncated to `M` elements.
             if !layer.is_zero() {
-                let mut upper = Vec::new();
-                (&zero[..end])
-                    .into_par_iter()
+                let upper = (&zero[..end])
+                    .into_iter()
                     .map(|zero| UpperNode::from_zero(&zero.read()))
-                    .collect_into_vec(&mut upper);
+                    .collect();
                 layers[layer.0 - 1] = upper;
             }
         }