diff --git a/cxy_opt/render.h b/cxy_opt/render.h
index c7200a8..aed0851 100644
--- a/cxy_opt/render.h
+++ b/cxy_opt/render.h
@@ -1,6 +1,6 @@
 #ifndef __RENDER_H
 #define __RENDER_H
-#pragma GCC optimize ("O3")
+#pragma GCC optimize ("O1")
 #include <stdlib.h>
 #include <time.h>