--- a/configure	2024-04-17 18:18:21.000000000 +0100
+++ b/configure	2024-04-28 12:43:47.327538032 +0100
@@ -1135,7 +1135,7 @@ fi
 
 #GCC opt
 if test "$no_gcc_opt" = "no"; then
-    CFLAGS="-O3 $CFLAGS"
+    CFLAGS="$CFLAGS"
 else
 
 #on emscripten+asan, failure to load wasm when build with -00, use -01