XGL performance & bugs on gutsy

[Samuel Thurston, III]

I've got a Dell inspiron 700m with intel i855 graphics.  Before gutsy,
beryl and XGL ran fine, my only problem was with 3d games, the effect
was glitchy and so i would disable XGL for this purpose.

However now, compiz only does transparent windows and shading. cube
doesn't work.  beryl has unresolved dependencies.  and the worst part:

XGL is always hogging 10% of my system resources, even when i have
effects turned off.  3D games run unplayably slow and even just
regular browser window scrolling and video playback are jerky and
freeze up from time to time.  3d screensavers cause a weird "double
vision" effect with gnome windows after i unlock the workstation.

How can I get rid of XGL on gutsy? This is so far the worst addition
to the Ubuntu desktop I have seen... it has no practical purpose and
has effectively crippled my workstation.