This helped for me:
http://www.nvnews.net/vbulletin/showthread.php?t=118088
my xorg.conf options (not sure if these should be here):
Option "PixmapCacheSize" "1000000"
Option "AllowSHMPixmaps" "0"
Option "PixmapCache" "1"
Option "PixmapCacheRoundSizeKB" "1024"
Option "InitialPixmapPlacement" "2"
Option "GlyphCache" "1"
from command line:
nvidia-settings -a InitialPixmapPlacement=2 -a GlyphCache=1
Also fixed the x-server restart problem
(https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-
drivers-177/+bug/258357).
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[X1650 Pro] Xorg lockup when using xserver-xorg-video-ati
1:6.9.0+git20080826.a3cc1d7a-2ubuntu3
https://bugs.launchpad.net/bugs/276518
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