I built my own computer, and it exceeds the recommended requirements, but for some strange reason, there is a slight lag in single player, and not in multi. It must have to do with new software because I never had this problem before a year ago. I suspect it has something to do with the video card or drivers, because it seems to get slightly better with the Omega drivers, instead of the catalyst. I am using a Radeon 9800 PRO 128 with over a Gig of high speed RAM, and an AMD 2800+ CPU. To be more specific, the lag has more of a skip when scrolling the screen over. The splash screen in the menus, work just fine and the cinematics work, just not single player. All of my drivers are up to date and I am using Window XP Pro. Does anyone have any ideas?