I think it may be related to direct rendering being available or not:

glxinfor | grep direct

NVIDIA GeForce FX 5500
- direct rendering: No
- behaves as described in the previous post

NVIDIA GeForce 6200
- direct rendering: Yes
- window drawing is always fast (both with compiz and without it)
- video playback is OK without compiz.
- video is corrupt (just a colour pattern) with compiz on in both totem an 
gxine.

Can you check your direct rendering configuration?

-- 
kde apps draw very slowly
https://bugs.launchpad.net/bugs/137401
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