OK, with window contents not being drawn with window effects, you must turn one
option off.
I think it's that:
Option "XAANoOffscreenPixmaps" "true"
If it's not the one, let me know and I'll find it.
Otherwise, it's also known that window contents are drawn slower with desktop
effects than normally for the radeon driver.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Needs Info => Unconfirmed
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Xorg radeon driver is slower in feisty, some gtk-buttons gets scrambled
https://launchpad.net/bugs/91661
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