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0e1f616
(Get the code!)
Why "won't fix"?
On my ASUS eeePC 1005P (Ubuntu 12.04, 3.2.0-24-generic) I can reproduce this bug. The internal display has 1024x600 resolution. I plugged in an external monitor (resolution: 1920x1080) and arranged it with gnome display setting horizontally. The result is the described slow display rendering. If I arrange the display vertically everything is fine.
Then I tried the same after activating the plugin ("Copy to texture") in ccsm. I restarted my mashine, arranged the window horizontally but the problem is still there. "xrandr --output VGA1 --right-of LVDS1" has the same effect.
$ glxinfo -l | grep GL_MAX_TEXTURE_SIZE
GL_MAX_TEXTURE_SIZE = 2048