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[j-stuffer <996343@xxxxxxxxxxxxxxxxxx>]

Hi, I hope this is the right bug report to comment on :)

For me several games still run really slowy in Unity, but run okay in Unity 2D or on a seperate X-server. Recent examples are Dustforce, Oil Rush and Jamestown. For example Oil Rush with ultra/high has 53 fps in the main window on a seperate X-server but only has 33 fps and very laggy mouse cursor under unity. Dustforce and Jamestown are not even 3D-games and have very simple graphics but are very slow in Unity. Both run really smoothly in Unity 2D or on a seperate X-server (ctrl+alt+f1, log in and then startx /usr/bin/ck-launch-session /opt/jamestown/Jamestown -- :1).
I also tested:
- Gnome Classic with effects: Same issue as with Unity 3D
- Gnome 3 Shell: No problems

The cause for the problem could also be the proprietary nvidia drivers.
For example Jamestown and Dustforce on my main PC (Core 2 Duo 2.66 GHz,
GeForce GTS 450) have performance problems with Unity. But on my laptop
(Dell Studio 1558 i3 with ATI 5740, I think) both games run okay (didn't
test Oilrush, as the download is very big). And that's a bit surprising,
as my Desktop PC overall should provide a lot more gaming performance
than my Laptop.

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https://bugs.launchpad.net/bugs/996343

Title:
  Game performance is choppier with compiz enabled (not unity)

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