I'm experiencing a quite simillar issue: The gnome-cups-icon process seem to cause heavy cpu load at random times (I didn't manage to reproduce it on purpose) It only comes back to normal once killed / automatically restarted.
** Also affects: gnome-cups-manager (Ubuntu)
Importance: Undecided
Status: Unconfirmed
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The gnome-cups-icon is way too active
https://launchpad.net/bugs/68789
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