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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