Comment 5 for bug 1071284

Izidor,

It appears the combination of a large desktop (multiple monitors), the nvidia driver, and Unity is the problem. Obviously we should only expect Nvidia or Unity to change.

A relevant fix has been released in Nux 3.10 recently. Please make sure your libnux packages are at 3.10 or later.

For Nvidia, they claim to have made major leaps in Unity performance with their v310 beta driver, so please try that too:
  http://www.nvidia.com/object/linux-display-amd64-310.14-driver.html
  http://www.nvidia.com/object/linux-display-ia32-310.14-driver.html

Finally, please provide details of your installation by running this command:
  apport-collect 1071284

And in future, please report bugs using this command:
  ubuntu-bug unity