So I just bought a MBP 17 5i, 4gb of ram and I've been playing at highest resolution 1200, and on medium. The controls are very choppy, the mouse seems to accelerate if i move my mouse faster and I'm not happy at all with the performance.there anything I I returned an HP ENVY 17 i7 quad core with 8gb of ram and 1gb of video ram which I could play on ultra no problem. I am playing on mac os x because I don't have a new win7 cd code just an upgrade key. Is there anything I can do to fix this problem? I'd be very happy to play on medium but it's frustating because I used to be top 10 in my diamond division and now I can barely play because I can't click things because of the choppiness.