Can you run the following diagnostic?:

* open a terminal window and enter the "top" command (without the quotes)
* tell us which process/processes are using the majority of CPU time
* you can press "1" to toggle between average CPU use display and individual 
CPU core use display if you want
* press "q" to quit top

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https://bugs.launchpad.net/bugs/1453378

Title:
  100% GPU load even with disabled hardware acceleration

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