diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index e0f9a002..c47a8b28 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -92,13 +92,13 @@ jobs:
       # - name: Conv overflow (wasi)
       #   run: cargo wasi test conv_col_ultra_overflow -- --include-ignored --nocapture
       - name: lookup overflow
-        run: cargo nextest run  --release lookup_ultra_overflow --no-capture --features icicle -- --include-ignored
+        run: cargo nextest run lookup_ultra_overflow --no-capture --features icicle -- --include-ignored
       - name: Matmul overflow
         run: RUST_LOG=debug cargo nextest run matmul_col_ultra_overflow --no-capture --features icicle -- --include-ignored
       - name: Conv overflow
         run: RUST_LOG=debug cargo nextest run conv_col_ultra_overflow --no-capture --features icicle -- --include-ignored
       - name: Conv + relu overflow
-        run: cargo nextest run  --release conv_relu_col_ultra_overflow --no-capture --features icicle -- --include-ignored
+        run: cargo nextest run conv_relu_col_ultra_overflow --no-capture --features icicle -- --include-ignored
 
   ultra-overflow-tests_og-lookup:
     runs-on: non-gpu
@@ -509,7 +509,7 @@ jobs:
           crate: cargo-nextest
           locked: true
       - name: KZG )tests
-        run: cargo nextest run --release --verbose tests_aggr::kzg_aggr_prove_and_verify_  --features icicle --test-threads 1 -- --include-ignored
+        run: cargo nextest run --verbose tests_aggr::kzg_aggr_prove_and_verify_  --features icicle --test-threads 1 -- --include-ignored
 
   prove-and-verify-aggr-tests:
     runs-on: large-self-hosted
diff --git a/Cargo.toml b/Cargo.toml
index 50b86810..30dcfb0a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -217,7 +217,7 @@ halo2_proofs = { git = "https://github.com/zkonduit/halo2?branch=ac/cache-lookup
 
 [profile.release]
 rustflags = ["-C", "relocation-model=pic"]
-# lto = "fat"
-# codegen-units = 1
+lto = "fat"
+codegen-units = 1
 # panic = "abort"