hitting full speed with between 2 and 3 frame skip (without sound). 5 to 7 with. Games that use an on cart DSP chip run like a dog, or not at all. Pretty good fun still, especially for roleplaying stuff, or harvest moon I also found R-Type 3 and cannon fodder playable. Button's are problemtic, most games didn't use all the buttons, so it's not so much of a problem, but those that do you have to switch to a differant control set ( Iv'e got mine set so that the shoulder buttons switch their functions).