Comment 7 for bug 737454

So exactly what is wrong:

It seems to be nvidia's proprietary driver problem on 8*** cards when using external monitor with large resolution (1920*1200). Compiz is very slow to handle opened windows. Works fine without the external monitor just at native notebook's resolution.

The only solution is nouveau driver. Appears to be working fine at acceptable performance except of the time when Unity crashes itself.

So as I understand ubuntu's team won't be able to help with this issue?