Possible Duplicate:
How do I enable llvmpipe rendering in Unity?
What would be the best way to disable 3d effects/compiz on ubuntu 12.10 (quantal quetzal)?
I found a way to disable some effects by switching to llvmpie-rendering (meant for low-spec PCs and to save battery). But it seems to be very buggy and not ready to use - so I disabled it again!
PS: I welcome any additional tip/tweak to increase the overall snappiness on old hardware :-)