https://bugs.freedesktop.org/show_bug.cgi?id=30329
--- Comment #7 from Michele Corazza ashmikuz@gmail.com 2010-10-12 05:47:26 PDT --- I can confirm general slowness with ati mobility 4570 and open driver (using xorg-edgers ubuntu ppa and latest 2.6.36 kernel from mainline). I read about problems using blur and lanczos effects on kde 4.5 and disabled blur, as lanczos cannot be disabled (afaik). I also turned off vsync for kwin as i noticed this has increased performance. Present windows effects is at 6fps also for me.