I also have similar problem, it's a single core system, xorg processes
uses all the idle CPU and desktop is quite slow to respond. I've
upgraded from jaunty (to karmic beta, to be more accurate: the state of
ubuntu repositories at october 4) where I hadn't got this problem. I'm
using nvidia's binary driver which is in ubuntu repositories.

xserver-xorg:
  Installed: 1:7.4+3ubuntu5
  Candidate: 1:7.4+3ubuntu5
  Version table:
 *** 1:7.4+3ubuntu5 0
        500 http://archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status
nvidia-185-kernel-source:
  Installed: 185.18.36-0ubuntu3
  Candidate: 185.18.36-0ubuntu3
  Version table:
 *** 185.18.36-0ubuntu3 0
        500 http://archive.ubuntu.com karmic/restricted Packages
        100 /var/lib/dpkg/status

-- 
Xorg continuously taking up 15% CPU, system slow, GUI windows take several 
seconds to draw
https://bugs.launchpad.net/bugs/441505
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