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I would like to install a compositor in unity 2D.

And I've noticed a number of other compositors: compiz, mutter, xcompmgr, xfwm4, etc.

I'm interested in using a lightweight compositor but I need to understand the differences between them.

Can someone give me guidance?

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I would recommend the use of the metacity compositor. It's lightweight, effective, and generally used with Unity-2D.

To enable the metacity compositor, go to your terminal and paste:

gconftool-2 -s '/apps/metacity/general/compositing_manager' --type bool true

To disable:

gconftool-2 -s '/apps/metacity/general/compositing_manager' --type bool false

You may have to log out and log back in to see a difference. Hope this helps!

To make the above process easier, the latest Ubuntu Tweak (0.7.1) can now enable and tweak metacity compositor settings.

See this article for more information.

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