I have tested in Intrepid (fully updated at this very moment) the new
2.4.3 Intel driver:

- same issues with the rendering
- the performance has improved in around 50 FPS in glxgears reaching around 
1000 FPS (resolution 1400x900).

I also think the issue is in Mesa 7.2. The DRI Intel driver comes with Mesa.
When I turn the KDE 4.1 effects off there is no rendering corruption any more.

It seems there is some graphics memory corruption when several
applications use OpenGL simultaneously...

Any idea when Mesa 7.3 will be out and whether it will help and or will
be included in Ubuntu 8.10?

-- 
Poor graphics performance and rendering errors on Intel GM965 system, Ubuntu 
8.10
https://bugs.launchpad.net/bugs/252094
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