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[ngsupb <877438@xxxxxxxxxxxxxxxxxx>]

I have had this issue for 1-1.5 year despite of my and other bug reports. It was a pain to use Unity with compiz or compiz alone. Had to use 2d or nouveau drivers. Nouveau got new issues in 11.10 so it become even harder.
Certainly some bug exists in the proprietary drives. NVIDIA doesn't care of the old cards I am afraid they won't investigate this issue.

But I have solved all problems recently. 
Pulled out that bastard(8400m GS) and replaced it with hd 3650
Really any problem now. 

I am serious. hd 3650 is free from theses bugs for me. 
Thanks to ATI.

Luckly I have a MXM slot in the notebook. 
lspci | grep VGA
01:00.0 VGA compatible controller: ATI Technologies Inc Mobility Radeon HD 3650

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https://bugs.launchpad.net/bugs/877438

Title:
  Unity/compiz has sluggish performance on dual-head with nvidia driver

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