Comment 78 for bug 988079

I solved my problem with Gnome Classic and unwanted Unity dock showing in this session. I just disabled Unity Plugin in CompizConfig.

I've tested Unity from the SRU PPA (5.14.0+bzr2400ubuntu0+704) against Gnome Classic with Compiz (1:0.9.7.8-0ubuntu1.4).

Sync To VBlank - disabled
Unredirect fullscreen windows - enabled

I tested the following benchmarks Unigine Sanctuary 2.3 (fullscreen 1920 x 1080), Unigine Tropics 1.3 (fullscreen 1920 x 1080), Unigine Heaven 3.0 (fullscreen 1280 x 1024) and the results were the same for Unity and Gnome Classic (Compiz).

However when running Heaven benchmark in fullscreen 1920 x 1080 Unity was slower than pure Compiz.

Unity Gnome Classic (Compiz)
8.1 13.2
203 333
3.9 8.3
17.4 29.1

This was true for every time I run Heaven 3.0 in this screen resolution. Unity in this case is always slower than pure Compiz.