ok, I tried 9.4 now and I am impressed. Really, really impressed.
ut2004 no difference
vegastrike-svn: performance problem with ataraxia fighter base (fps went down to 7FPS and less) GONE. FPS never below 30! performance problem with asteroid field less severe. Went up from 3-7 FPS to 12-14. Not great but at least playable. FPS also get back to normal a lot faster. You can have your screen filled with asteroids and still get 30-40 fps (when not centering on the jump point, fps are always a lot higher).
turning on effects in kde 4.2.69 - sweet. CPU load when using tvtime went down a bit.