Since updating to snow leopard on my 2.8 MBP, video lags. Not just flash video, but also iTunes movies on my harddrive. It isn't so much choppy and stuttering as it is just lagging/retarding, in that it will lag a little and then speed up to catch back up to where it should be, and then lagging just a second or so behind and speeding up to catch up again...this is constant through all videos/movies, even when it's the only thing running. Anyone else??