Hi! I just noticed that this bug is known to upstream and is supposed to be fixed. https://bugs.freedesktop.org/show_bug.cgi?id=13389 Looks as if my problems are caused by a Debian package / build related problem? In the x11perf-benchmark mentioned in the upstream bug report, I get 27000 - 30000 80-char aa lines/sec in KDE 4.2 with compositing turned on, that's only a thenth of the value it should be. (My system is a Core 2 Duo T7200 @2,0GHz.) glxgears (which is no meaningful benchmark, I know, but it's a tendency indicator nontheless) also doesn't look too satisfying: 1022 frames in 5.0 seconds = 204.384 FPS 1019 frames in 5.0 seconds = 203.723 FPS Greetings, Gunter
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