Poor game performance? Try DirectX 9 mode

If you own some of the newer DirectX10-capable games like Bioshock or Crysis, but you are disappointed with the performance you are seeing when you run these games in their full DX10 glory, there's an option which you'll probably want to try. Navigate to the games folder ('start\games') and right click on the icon that starts your directX10 game. You should see a 'play DirectX 9' option. You may sacrifice a few of the visual bells and whistles, but your frame rates are almost guaranteed to be better.