1.86GHz, 4GB RAM, 13" MBA - I just installed SC2 today and went to play it and of course, I had been reading the forums prior to buying my Air, and many were saying Medium settings run just fine, some were even running on High. On Medium I'm lagging around the menu and in game and sometimes even Low lags. Anybody know what could be the problem? I just got this last Friday EDIT: It should be important to note, I did the combo update from 10.6.5 to 10.6.7, and from the looks of it, there has been a huge hit to FPS in many cases. Could this be it?