Well, when I loaded up the game I set it to 1440x900 in full screen mode, and everything was fine. When I went to the marketplace however, it froze for about 15 seconds before loading up the page, and another 15 seconds when exiting the marketplace. I searched the forums and seen that it was a common problem, so I changed to 1366x768 in windowed mode, and the marketplace loaded up fine with no problems. The only thing now, is there is a little bit of screen tearing which isn't there in 1440x900 full screen mode.
My monitor is set at 60 hz, and I've tried vertical sync on and off with no positive results. Graphic drivers are latest, and I'm using Windows Vista Home Basic 32 bit with service pack 2.
Any ideas? I really hope I don't have to decide between full screen with no tearing but a laggy marketplace, or window mode with tearing but a smooth marketplace.