diff --git a/benchmarks/.gitignore b/benchmarks/.gitignore
index a6779a9f..c51934f7 100644
--- a/benchmarks/.gitignore
+++ b/benchmarks/.gitignore
@@ -3,3 +3,4 @@
 pubspec.lock
 
 lib/generated/
+out/
diff --git a/benchmarks/tool/compile_benchmarks.dart b/benchmarks/tool/compile_benchmarks.dart
index 443dc890..267a207a 100755
--- a/benchmarks/tool/compile_benchmarks.dart
+++ b/benchmarks/tool/compile_benchmarks.dart
@@ -215,7 +215,7 @@ List<String> wasmProcessArgs(String sourceFile) {
     'compile',
     'wasm',
     sourceFile,
-    '-O4',
+    '-O2',
     '-o',
     'out/$baseNameNoExt.wasm',
   ];