Yup, it sounds like you have/had a kernel DRM issue.

Official support for Ubuntu 13.04 "Raring Ringtail" has ended.  Does
this issue still occur in Ubuntu 14.04 "Trusty Tahr"?

** Changed in: compiz (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1173828

Title:
  extreme performance issue with raring

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