7.5% is huge when most optimizations are notable if they can get above 0.5%, there is NO statistical difference between -O2 and -O3 with Clang. This is a huge

7.5% is huge when most optimizations are notable if they can get above 0.5%, there is NO statistical difference between -O2 and -O3 with Clang. This is a huge result, of which many will follow.