I've got increases of up to 10% in some games. Mario Kart 64 attract mode didn't appear to dip below 60%, and the 1080 Snowboarding attract mode didn't dip much below 60% all that often either. Rush 2 Extreme Racing does not seem to benefit unfortunately, running between 45% and 53% during the attract mode. I couldn't really test some others as it seems controller support is now broken?
I tested this without changing USE_SIMD to 1 or using the ARCHOPTS=-march=core2 command, so if there would be further improvement there, that would be a plus of course
