Kevin Kofler said the following on 07/13/2008 04:49 AM:
Vini Engel <vini <at> fugspbr.org> writes:
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.
The proprietary nvidia driver is known to have absymal performance, and we
can't fix it because it's proprietary. Blame nVidia. There's nothing we can do
about it.
Well, it may not be the best driver out there but before Fedora 9 it did
work very well for me. The fact is that my problem is not really related
to performance, the overall performance of my machine is pretty good.
The problem is that xorg and kwin use too much CPU, it doesn't bother me
much apart from using more battery. If it doesn't jump up to 80% my
machine goes ok, I have disabled some of the desktop effects and it
improved.
I think we cannot blame nVidia for this because what is being used here
is the CPU and not the GPU. Unless there is clear proof that their drive
actually causes it to happen the problem to me will be related to the
way KDE4 is handling OpenGL for its 'special' effects.
Vini
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