I don't know all that much about how emulation works, but I thought
this was noteworthy when I stumbled on it purely by chance:
http://mamedev.org/updates/whatsnew_0127u1.txt
Says in the update fixes for August 28th that the refresh rate on all
CPS3 games was wrong. Didn't go on to say whether it was too slow
or too fast, but I thought it was interesting nontheless.