Hey everyone, question for you guys. I was thinking about getting a macbook fairly soon, until I tried out my girlfriend's. We had recently upgraded her MB to 2gb ram, to work more efficiently in Photoshop/Illustrator. However, under firefox, even low-res youtube videos tend to run choppy. Full screen playback of movies is a bit of a rough experience. Any possible causes/remedies for this? Thanks! EDIT: It is one of the earlier MB's.. not necessarily the first rev (or.. generation, not sure if there have been actual revision per se), in which case it is around the 3rd (or, second updated version since release). Overheating perhaps?