KWin (KDE4 from rawhide) using way too much CPU (nvidia driver problem)

[Kevin Kofler]

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.

        Kevin Kofler