It was a hardware issue and it is now fixed. You can read more about it
here http://askubuntu.com/questions/122055/poor-system-performance-on-
my-machine-running-ubuntu-12-04beta-2-updated-to-the
** Changed in: ubuntu
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/982488
Title:
Poor System performance on my machine running Ubuntu 12.04(Beta 2
updated to the present moment)
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