Maybe your bios then? Not sure. Or maybe you have a slow SD card? I take it you have all the right settings set? Like resampler audio quality lowest in settings, audio sync instead of vsync.Maybe a mishmash build of 2002 with remaps from 2005 would work?
Also, I can’t even get PS1 games to run well. I’m using CHD roms and tweaking all the settings towards “fast, looks shitty but it’s ok” and it only hits 30fps or above if I’m LUCKY.
How do I do it?