I'm also having low Compiz performance, specially in menus, with the
following configuration:

- Graphic processor: ATI Radeon HD 5750
- Graphic driver: fglrx
- Graphic processor family processing power: 4,7 TFLOPS
- Screen resolution: 1920x1080
- Screen refresh frequency: 60 Hz

- Maximum glxgears benchmark of 5 with Compiz off: 37702 images / 5 seconds
- Maximum glxgears benchmark of 5 with Compiz on: 11087 images / 5 seconds


And some details I found are:

- GIMP has much low performance on menus than Nautilus.
- Firefox has better performance on menus than Nautilus.
- Menu performance is proportionally inverse to screen resolution, but other 
effects performance isn't.
- Many windows animations freeze for about half a second before taking place, 
for any screen resolution.

-- 
opengl performance regression with compiz
https://bugs.launchpad.net/bugs/533495
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