Daniel, the performance drop with activated Unity is quite large, so my
eyes can catch the change in performance easily.

Animations, moving wobbly windows - all is much smoother without Unity.

But it is also possible to measure the performance drop with the Compiz
benchmark tool:

You just have to take a large window and move it around wildly, because
otherwise Compiz Standalone gets to sleep and shows just around 3-6 fps
here, which also shows that the damage detection seems to work, while
Unity always renders more than 20fps, even if your screen content almost
does not change.

If I move a big window around with Unity activated (dual-screen), the benchmark 
never shows more than 28 fps.
With deactivated unityshell I can get it to show around 40-60 fps, which 
reflects my observation.

om26er, this bug already was reported before (bug 988079), but it was
marked as fixed, which I cannot confirm here, so I decided to file a new
bug.

** Changed in: unity
       Status: Incomplete => New

** Changed in: unity (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1049392

Title:
  Unityshell slows down Compiz massively

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