low framerate with SiS 630 dri on Ubuntu 6.06 Dapper Drake -- DRI and/or OpenGL not working properly?

Hi,

Disclaimer: I'm really new to Linux (I have some BSD/UNIX/Win/DOS/etc.
knowledge). It's very possible that I'm missing/screwing up some
really basic stuff.

I have problems getting DRI and/or OpenGL applications to work properly.

The current Google Earth beta is doggone slow and actually crashes
Ubuntu. The Chromium game is unplayably, horribly slow. Glxgears looks
fairly ok, but I'm told that its framerate is inordinately slow.

I have two forum threads open on this issue:

One at:
  http://ubuntuforums.org/showthread.php?t=262331
(where I've pretty much logged what I've done without getting a lot of
responses).

And another at:
  http://www.winischhofer.eu/sisforum/viewtopic.php?p=925
where a friendly poster referred me to this mailing list.

Again, my problem is sub-par performance of OpenGL/DRI related applications.
Is there anything I can do?

I know these two forum threads are long -- maybe you don't even need
to read through them, but maybe some among you have got a suggestion
what I could do to better diagnose and/or fix my problem?

I'd be very happy to hear from you! :)

Thanks and regards,
--ropers

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