Go give it a whirl so I know if works or doesn't work on your system(system specs would be nice). You should get around 60 FPS, anything else and it means either your computer sucks or my timing code sucks, probably both. Actually I've been having problems with GameBoy Color games that run in double speed mode, seems my 2Ghz machine can't handle an 8Mhz Z80. If you'll looking for some ROMs, Mr. Zophar has a couple you can use.
Still haven't gotten around to adding anything thanks to heaps of school work. School ends in three weeks and I plan to take a one week break(I'll need it) before starting my summer job, so hopefully I can add sound and save states then.
I'm blaming Ravuya and so should you.