Stuff like Fate of Atlantis is extremely playable on an 060 if you drop the audio rate. I felt like the previous version (0.7) was faster, though. There seems to be a bug, however, when exiting the program - it trashes something video-related, so I get an "Out of sync" error on my monitor. Happens both in 0.7 and 0.9.
WarpScumm had absolutely fantastic speed - shows you what an Amiga-optimized SDL library can do - but it's unfortunately only comparable to ScummVM 0.2 in terms of game compatibility.