FS1 felt more like 60 to 70% in fGen (I timed the games against a real clock for 1 minute; on the emulator roughly 40 seconds would pass). FS2 was about 80 to 95%.
Genemu has a faster FS1, but that's it. (I'm calling it FS1 because it returns 21 to 24 FPS and appears to run at 75% speed...unless the overclocked FXEs return unreliable numbers like SNESemu and fGen do). If it had FS2 it'd probably be near fullspeed.