For start, you should check it which application is using most of your cpu with 
"System Monitor" or "top" from terminal.
Run this in terminal:

top -b -n 3 > top-log.txt
(wait few seconds)

and attach top-log.txt here.

** Changed in: ubuntu
       Status: New => Incomplete

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Process usage is 50% all the time
https://bugs.launchpad.net/bugs/352084
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