What version of bleem are you using? From what I've seen, some games which run awfully slow on 1.5b run very well on 1.4a (Motoracer 2, for example runs full speed while on epsxe it doesn't, and my computer is SLOW). Other games which skip on 1.4a runs well on 1.5b (example, Earthworm Jim 2). Just experiment on different versions. This is due to a glitch in the speed limiter of the program. Version 1.4a and earlier have an advantage of adjusting the limiter manually.