I have also found similar problem during googling here:
http://ubuntuforums.org/showthread.php?t=2232737
** Changed in: xorg-server (Ubuntu)
Status: Expired => Confirmed
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which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1456326
Title:
XServer eats up 100% cpu and is very slow on specific tasks with xfce
desktop
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