Poor composting performance in KDE 4.3

[Paul Hartman]

On Thu, Oct 15, 2009 at 2:01 PM, Dotan Cohen <dotancohen at gmail.com> wrote:
> The wife's desktop is running KDE 4.3 on a fairly decent homebuilt
> machine: 2 gHz dual-core processor, 2 GB RAM, ATI graphics:
> $ lspci | grep ati
> 00:18.0 Host bridge: Advanced Micro Devices [AMD] K8
> [Athlon64/Opteron] HyperTransport Technology Configuration
> 01:05.0 VGA compatible controller: ATI Technologies Inc Radeon HD 3200 Graphics
>
> The composting effects are terribly slow, and many effects (Wobby
> Windows, Cover Switch) refuse to start. I have tried googling KDE4
> composting problems, but all I find are complaints and no solutions.
> Where can I start troubleshooting? The distro is Kubuntu 9.04, same as
> I run on my daily driver laptop with inferior hardware and no
> problems.
>
> Thanks in advance for any ideas.

On my laptop with Radeon 9700, performance of X.org in general was
terrible until I got the advice to set this in xorg.conf "Device"
section for radeon:

       Option      "AccelMethod" "EXA"

After I did that it was flying fast again :) FWIW
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