KWin (KDE4 from rawhide) using way too much CPU

Vini Engel vini at
Sat Jul 12 11:23:31 UTC 2008

Ho Colin,

Colin J Thomson said the following on 07/12/2008 08:30 PM:
> Hi,
> On Saturday 12 July 2008 10:38:55 Vini Engel wrote:
>> 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.
> Yes KDE4.1 is excellent, I use the packages from kde-redhat.

Redhat meaning, not the ones from Fedora? You are actually running a 
Redhat distro as opposed to a Redhat sponsored distro?

>> 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.
> Try disabling "VSync" in System Settings > Desktop > Advanced, this will drop 
> the Kwin cpu usage.

I have just tried that, I didn't seem to have changed anything.

> There was also a bug causing heavy CPU use if you had the Lock/Logout widget 
> in the Panel, but I think this could of been fixed now. I can't remember/find 
> the Bug #'s off hand though.

Maybe this is another bug, do you know how I would go about reporting it?


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