Some observations:

* For me, this happens only when the Bluetooth page in systemsettings is opened.
* Doesn't matter if windowed or staged mode
* Happens on all devices

turns out the Bluetooth Page in systemsettings is animating 3
ActivityIndicators even when they are not visible.

Not sure how that causes unity8's CPU usage to be that high, but the
linked ubuntu-system-settings branch improves the situation a lot.

However, given that the ActivityIndicators are invisible, we probably
should investigate why they keep on triggering rendering updates.

Adding ubuntu-system-settings, qtmir and qtubuntu.

** Branch linked: lp:~mzanetti/ubuntu-system-settings/only-animate-when-
visible

** Also affects: qtmir
   Importance: Undecided
       Status: New

** Also affects: ubuntu-system-settings-online-accounts
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1513450

Title:
  higher than expected cpu for unity8

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