As far as I could see from the short time I got to test the 3D performance on Feisty (gnome packages broke yesterday so now I'm back on os x) the cpu usage seemed normal while running glxgears and ppracer though I'm not 100% sure. Maybe you could try the Feisty LiveCD on your computer? I'm unable to on mine as there is no LiveCD available for PowerPC yet...
-- ATI radeon: poor 3D performance https://launchpad.net/bugs/56692 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
