The ones straight out of the box. That's as pretty clear as I can make it. The open source drivers, which are used in Ubuntu by default, will run compiz and do not suffer from the same 2D performance issues you were experiencing.That's the only drivers i know of and tried. What drivers do stock ubuntu come with that enables my card to work well with compiz straight out of the box.
Not at 2D operations, particularly composited ones.Shouldn't installing a recent ATI driver give me even better performance?
Depends on the game, but that is likely the case, yes.I have a feeling i will need ATI over stock ubuntu when it's time to game.