diff --git a/packages/superdough-wasm/README.md b/packages/superdough-wasm/README.md
index 19b1585da..c14acca70 100644
--- a/packages/superdough-wasm/README.md
+++ b/packages/superdough-wasm/README.md
@@ -33,6 +33,6 @@ npx http-server .. -o
 ```sh
 # brew install emscripten
 cd csaw
-emcc csaw.c -o csaw
+emcc -O2 csaw.c -o csaw
 npx http-server .. -o
 ```
diff --git a/packages/superdough-wasm/csaw/csaw.wasm b/packages/superdough-wasm/csaw/csaw.wasm
index 6edaa2d1a..5e77520bf 100755
Binary files a/packages/superdough-wasm/csaw/csaw.wasm and b/packages/superdough-wasm/csaw/csaw.wasm differ