I've been limiting it at 62, but what is the real framerate that ps2 games run at?
Leave it at 0 and it will automatically determine the normal PS2 rate. But if you want to set it manually, it's 50 for PAL and 60 for NTSC.
at 60fps the emulator is full speed for NTSC, 50fps for PAL. You'll see next to the framerate a percentage. 100% is full speed.
NTSC is actually 59.94 I believe, more or less 60fps but not exactly.