There are a couple of options which are now ignored under Lucid. For me
this works best:
Section "Device"
Identifier "Configured Video Device"
Driver "radeon"
VideoRam 65536
Option "AccelMethod" "EXA"
EndSection
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[RV100] very poor Xorg performance on various older graphics HW - XAA no longer
works
https://bugs.launchpad.net/bugs/363238
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