Scott, I can confirm that setting EXAPixmaps to off helps. I my case, not only the speed but also correctness of the display is improved.
01:05.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility U1 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/544496 Title: [RS100] desktop became slow after upgrading to Lucid -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs