I have the same problem (mutter uses sometimes 100% and freeze my computer) 
with 10.10 release, here is my config :
Asus EeePC 1210N
nVidia ION VGA [GeForce 9400M]
nVidia driver : version 260.19.06

I don't know if it's related or not, but I experienced other various (but less 
important) bugs like :
- When i click the "Applications" icon on the right bar, icons take a lot of 
time to display (texts display immediately), sometimes only a few icons will 
finally display and other won't display even if i wait a long time
- Icons on the right bar are white when i get back to my desktop after having 
launched a full screen game

Is it related to Unity, my driver or both ? Can I fix this on my own
(for example downgrading my driver) ?

Thank you for your great work.

-- 
mutter takes 100% CPU for simple tasks
https://bugs.launchpad.net/bugs/448420
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