It looks like subprocess.Popen.poll() is the culprit. Calling it too
often (e.g. when idle) results in a very high CPU consumption.

** Changed in: software-center (Ubuntu)
       Status: Confirmed => In Progress

** Changed in: software-center (Ubuntu)
     Assignee: (unassigned) => Olivier Tilloy (osomon)

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Opening "Software Sources" through Ubuntu Software Center causes 100% CPU
https://bugs.launchpad.net/bugs/459521
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