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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