I experienced this after upgrading to Hardy as well.

Adding the following to the "Device" section of my xorg.conf file brought Xorg 
CPU usage back to a sane level:
  Option "UseEvents" "True"

The various nvidia driver options are documented here:
http://tw.download.nvidia.com/solaris/96.43.05/README/appendix-d.html

-- 
[Hardy] Xorg high CPU usage with 2.6.24 kernel and nvidia-glx
https://bugs.launchpad.net/bugs/178400
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