X is slow on 2.6-test6 kernel

[Nathan Weston <elbows@spamcop.net>]

I just installed 2.6.0-test6, and X is incredibly slow -- if I minimize a 
window which covers most of the screen, I can watch the redraw creep down the 
screen, taking about 1 second to finish.

I'm using a PCI GeForce2 MX with the 4496 driver from NVidia. Under 2.4.21, 
the same driver produces good results. I haven't been able to test other 
cards or drivers.

Nathan