The discussion regards Vsync and Triple Buffering interested me based on the frame rate integer jumps that Ataros mentioned.
I have always had Vsync enabled and triple Buffers set but decided to test a MP session with Vsync disabled and Triple buffers Off. Apart from the screen tearing, I was acheivineg 80+ fps at altitude and game play was much better even in the hotspots were FPS sink badly - it seemed much smoother even when fps went below 30.
I am torn wether to put up with the screen tearing (which isn't so bad that its unplayable with headtracking) or go back to Vsync capping at 60hz
EDIT: After writing this I did a bit of googling and found this interesting article regards Vsync/Triple Buffering and the advantages/disadvantages.
http://www.tweakguides.com/Graphics_9.html
This link explains how Triple Buffering works - why it isn't supported in DirectX3D, etc.
http://www.anandtech.com/show/2794/1