I think we would need a stack trace of the problem. Please do:
1. Apply the workaround from bug 994921.
2. Open a terminal or log in to another VT (Ctrl+Alt+F4).
3. Reproduce the high CPU problem.
4. While the problem is occurring, run:
killall -ARBT `pidof -s gnome-shell`
5. Look in /var/crash for the crash file.
6. Create a new bug using this command:
ubuntu-bug /var/crash/YOURFILE.crash
7. Tell us here the ID of the new bug.
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1753020
Title:
High CPU usage in gnome-shell, occurs randomly
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