Do you have a problem when you roll your plane close to the ground with ground clutter on and the roll is very uneven, pausing momentarily then accelerating, then slowing again? The solution I found works with both my radeon and radeon 8500 cards, but could work for many more. I just went to the D3D options and turned off the "wait for vertical synch" option. Now the frame rates are higher and the rolls are fluid.
PapaFox