F10 compositing incredibly slow

[Chris Bredesen <cbredesen redhat com>]

Hello List,

I'm not sure if this goes on test-list or not but I'm running F10 
originally installed from Beta but fully up to date.

Compositing has been horrible from day one.  I've tried the minimal 
Compiz that comes with Gnome, I've tried full-on Compiz Fusion and I've 
tried KDE's compositing.  The performance is equally bad in all three. 
I've run Compiz on FC6 and F8 using this laptop (Intel GMA950) and the 
GPU is more than adequate to make the effects useful.

Direct rendering seems to be enabled:

$ glxinfo |grep direct
direct rendering: Yes

I don't know what else to check.  Any pointers?

-Chris