When I try to play Flash videos in full screen, sometimes - but not all the time, which makes this bug so aggravating! - the video gets very, VERY choppy, and UI controls do not really respond at all. Sound works fine. Disabling Compiz does nothing to alleviate the problem (switching to Ubuntu Classic (No Effects) - I even created a new user just to test this out to make sure it wasn't a local configuration problem).
This problem exists both in the latest beta build of Chrome and the most up-to-date Firefox with latest Flash. No problems when I watch a video in full-screen, it seems to be just Flash.. and videos tend to play just fine when not in full-screen mode.
I'm on a Thinkpad W510 with an nVidia Quadro FX 880M graphics card.
If anyone could be help this would be much appreciated.