another thread dealing with the same problem is here :

http://www.lfsforum.com/showthread.php?p=27131

It´s even cooler if u watch this slomo-video in slomo

(for example in VLC-Media-Player)

I had exactly the same with my new Gfx-Card (ATI Radeon 9250)

look for the 3D-tab in your advanced ATI-display settings and look for the perfomance/quality slider and move it 1 click to the quality-side, that fixed it for me...