diff --git a/flake.nix b/flake.nix
index 1cc8ff4..78beadc 100644
--- a/flake.nix
+++ b/flake.nix
@@ -23,6 +23,7 @@
           buildPhase = ''
             export HOME=$TMPDIR
             cd cgol && wasm-pack build --release --target web && cd ..
+            wasm-opt cgol/pkg/cgol_bg.wasm -o cgol/pkg/cgol_bg.wasm -O4 --enable-bulk-memory --enable-nontrapping-float-to-int --enable-sign-ext --low-memory-unused --converge
             npm ci
             npm run build
           '';