When watching a 720p video on Youtube, my Mac jumps to like 50-60% CPU usage. The frame rate slows and is almost unbearable to watch. I have also noticed that if I leave my MBP on for like >3 days then sooner or later my computer will get really sluggish and unresponsive. I end up having to restart because the CPU is going so insanely high. Okay, as I write this, I am having huge CPU jumps while doing nothing but typing this. Yes, Youtube is open in another window, but still.... Any ideas? I thought I could leave my computer on for weeks without problems....but anyway I restarted today and still have this Youtube problem.