diff --git a/Yattee.xcodeproj/project.pbxproj b/Yattee.xcodeproj/project.pbxproj
index f7a9fbc4..839fa251 100644
--- a/Yattee.xcodeproj/project.pbxproj
+++ b/Yattee.xcodeproj/project.pbxproj
@@ -4326,6 +4326,7 @@
 				ENABLE_USER_SCRIPT_SANDBOXING = NO;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 3;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;