I have a new Mac Pro Quad 2.8 with 12 Gigs of RAM running on on 10.6.6 with the latest browsers, Flash etc. It seems that if I am watching a video in another browser window (Safari, Chrome, Chromium etc), MLS, Fox Soccer, NCAA Basketball etc, and browsing in another, it DEFINITELY effects the video. The video is running perfecting then when I bring up MacRumors, for example, the video will stutter for a couple of seconds them once the site is rendered it goes back to normal. I figured with all the horsepower, I would not have this problem. I'm on a cable modem with speeds of about 25M Down and 2M Up, directly connected to gigabit ethernet port on Apple Airport. Any ideas?