On a dell latitude E6400 with ubuntu intrepid 8.10 I also get a very
very poor performance, woth for 3D and 2D graphics. glxgears performance
is 200 fps. The server is xserver-xorg-video-intel  2:2.4.1-1ubuntu10.
The output of lspci |grep VGA is:

00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series
Chipset Integrated Graphics Controller (rev 07)

I have tried the various suggestions above but none significantly
improve the performance.

I consider this is a critical bug. Does anybody know whether developers
are working on it? It would be very convenient in the meanwhile to be
able to install older xserver packages in ubuntu 8.10 without this
problem. Is this possible?

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[i965] Poor graphics performance and rendering errors on Intel GM965 system, 
Ubuntu 8.10
https://bugs.launchpad.net/bugs/252094
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