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[Lem <lem.jjr@xxxxxxxxx>]

I have issues with Compiz performance in Expo only. Sometimes it will be
silky smooth, other times it'll stutter at 30-40fps. It seems to be
totally random, and changes upon reboot. Window movement is silky smooth
all the time.

I've been doing some experimenting. Turning off sync to vblank in compiz
config settings manager makes Expo work fast. Sync to vblank in nvidia-
settings seems to have no effect on compiz being sync'd or not (yes I
restart compiz after changing the setting).

My setup is a Phenom 9850 (2.5GHz, 4 cores), GeForce GTX260 216 OC, 4Gb
DDR2-800, Ubuntu 10.04 AMD64, Samsung 225BW (1680x1050 LCD). Compiz is
set to not detect refresh rate, forced to 120 frames per second.

Currently, sync to vblank causes slow performance with compiz, and with
it disabled, compiz uses about 68% of a single core @ 2.5GHz and 1.25GHz
(makes no difference) going in and out of Expo constantly. I'll have to
test further when I happen to get good performance on boot up. Maybe the
issue I'm experiencing here is related to this thread?

-- 
[Lucid] Loading nvidia-settings hurts compiz performance
https://bugs.launchpad.net/bugs/574069
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which is subscribed to nvidia-settings in ubuntu.