I'm having trouble getting Unity to run properly. I can play HoN but if I log in with Unity the system becomes slow and laggy.I think this system had earlier versions of Unity running before but now it does not. One day in version 11.04 it started freezing so I upgraded to 12.04 to see if the issue would disappear by itself but it didn't.
I'm using the drivers included in Additional Drivers, "NVIDIA accelerated graphics driver(version current) [Recommended]".
I also got this error message when I logged in with Unity 2D that Window Decoration has stopped working or something. It also said something about Compiz.
How do I fix this?