I've done some tests with nexuiz (a full 3d game, quite intensive for
my video card)

without the option disable low impact fallback it is not playable,
after enabling it I got nearly 60fps, sometimes with 1 second hangs,
but the situation is not so bad...
I think the key for 3d games is this option! I think that I should see
the fps when using fglrx, but now it can't be used due to a X version
mismatch

After launching google earth with the option enabled, the system
hangs, as I reported before (a hard reboot is needed)

compiz does not take any advantage from this option :( it is sad
because compiz performance is quite bad!
scrolling is very slow (though improved) the animations are quite
huggy, and everything is highly dependent on the cpu usage of the
moment

also take a look ad this Xorg.0.log line
(II) RADEON(0): Render acceleration unsupported on Radeon 9500/9700 and newer.
(II) RADEON(0): Render acceleration disabled

Tormod, what do you think?

-- 
ATI radeon: poor 3D performance
https://bugs.launchpad.net/bugs/56692
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