KWin (KDE4 from rawhide) using way too much CPU

Vini Engel vini at
Sat Jul 12 09:38:55 UTC 2008

Hi All,

I believe many of the KDE users here might be using the rawhide build of 
KDE4. I have been updating to every new build of KDE hoping that more 
and more problems are going to be resolved. Thankfully all the major 
issues with KDE4 seem to be getting resolved but there are still some 
things that still look strange to me.

When I enable Desktop Effects kwin and xorg take about 30% of the CPU 
each. kwin sometimes takes as much as 80%, this is slowing down my 
machine heaps. Although I could just disable the desktop effects and 
resolve the problem I would rather give feedback to any KDE/Fedora 
developers out there and assist with the resolution of this issue.

My machine is an "Intel(R) Core(TM)2 Duo CPU T9300 @ 2.50GHz" with 4GB 
of RAM and a "nVidia Corporation GeForce 8400M GS" with 128MB.

I am running Fedora 9 x64 with the most up-to-date packages available 
through yum and the latest KDE4 from rawhide. See below two snapshots of 
TOP while my machine was idling.

21026 vini      20   0  398m  45m  33m R 48.5  1.1  26:21.97 kwin
20346 root      20   0  253m 101m 8264 S 14.8  2.6  24:48.59 Xorg
32034 vini      20   0  633m 120m  30m S  8.4  3.0  11:23.43 firefox
21244 vini      20   0  393m  31m  19m S  2.4  0.8   2:21.66 ksysguard

21026 vini      20   0  396m  43m  31m S 30.6  1.1  26:36.48 kwin
20346 root      20   0  254m 101m 8264 R 26.0  2.6  24:57.45 Xorg
32034 vini      20   0  633m 120m  30m S 10.4  3.0  11:28.59 firefox
21063 vini      20   0  452m  34m  21m S  3.6  0.9   0:21.42 plasma

I also would like to assist with testing KDE4 but I am unsure of where 
to report possible problems to. Can anyone point me in to the right 


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