I just got my new 15" 2.2ghz MBP today, and I'm having a pretty annoying problem. When it's plugged in everything works fine. Then when I'm using the battery, exposé and the dashboard are very sluggish. If I press the buttons to open them a few times it starts to run normally, so it seems like it's taking the GPU a few seconds to throttle up to normal speed. I did not have this problem on my old MBP with the X1600. How do I fix this?