Ubuntu 7.04 (PPC)
Apple PowerBook G4 5,4 (1.5GHz powerpc)
ATI Mobility Radeon 9600 (r300)

I can confirm this - it occurs when using Beryl although beryl CPU usage
is low (2-5%) Xorg shows between 20-50% depending on what's running.
Firefox for example, increases the load to around 30%.

This may be due to performance issues with the r300 driver. Attaching
xorg log and xorg config

** Attachment added: "Xorg log"
   http://librarian.launchpad.net/6674417/Xorg.0.log

-- 
Xorg constantly uses 25% CPU time
https://launchpad.net/bugs/86977

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