another great fix for the speed issue is to sync the audio to the game. at the top click on options>configure audio plugin. then a window pops up and you have the choice to log audio (record to a .wav file to play in media player) a slider on the left to control your volume, and (make sure you have a rom running!!!!) a button you can click labeled "sync game to audio"

almost always fixes my problem.

hope that helps.