Upstream has fixed this in git but until 3.8.4 comes out it would be good to get this patched in.
More info at
I only had to apply the mutter patch for OpenGL redirection to be fixed.
Steps to Reproduce:
1. Install mutter 3.8.3
2. Run full screen OpenGL game such as Heroes of Newerth
3. See performance is shit, especially after switching to the desktop and back to the game.
*mutter-3.8.3-r1 (28 Jul 2013)
28 Jul 2013; Pacho Ramos <firstname.lastname@example.org> +mutter-3.8.3-r1.ebuild,
Apply upstream fixes from 3.8 branch, also solving some games running slow.