--- CMakeLists.txt.orig	2018-08-14 17:54:04 UTC
+++ CMakeLists.txt
@@ -64,8 +64,7 @@ if( NOT WIN32 )
   set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -Wall -pg -ffast-math -funroll-loops -fstrict-aliasing")
   #set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Wall -pg -fsanitize=address -fno-omit-frame-pointer -fsanitize=undefined -fno-sanitize-recover -Wreturn-type -Werror=return-type")
   set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Wall -pg")
-  set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -O3 -ffast-math -funroll-loops -fstrict-aliasing")
-  set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3")
+  set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -ffast-math -funroll-loops -fstrict-aliasing")
   endif()
   if (APPLE)
     set (Apple 1)