I use ubuntu 13.04.
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https://bugs.launchpad.net/bugs/1123108
Title:
unity slow on dual monitors (extended desktop)
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I have the same issue on my Acer Extensa 4220 laptop with integrated
Intel graphics GMA 3000.
The unity on the LVDS (1280x800) works very well (Dash, window moving
and effects) but on both LVDS and VGA (1440x900) it works slow.
I can show more info if you need to resolve the bug. Moreover I can
