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[Niklas Wenzel <nikwen.developer@xxxxxxxxx>]

I'll do that as soon as I have the time to do so, hopefully later this
day. ;)

Meanwhile, I think I have found a method by which I can reproduce this bug very quickly.
I simply need to refresh a scope (e.g. the "Ubuntu News" scope) about 30 times and Unity8 gets to 15% of CPU usage. The more often I do it, the higher the value gets.
Maybe this works for you as well.

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Touch seeded packages, which is subscribed to unity8 in Ubuntu.
https://bugs.launchpad.net/bugs/1422898

Title:
  Excessive CPU usage, even when the screen is turned off

Status in unity8 package in Ubuntu:
  Confirmed

Bug description:
  Since mako image r102 (vivid-proposed), the CPU usage of Unity8 is very excessive and increasing over time.
  After boot, the phone runs smooth but after some time it lags heavily.

  As you can see from the attached output of the "top" command, Unity8
  consumes 23% of CPU power when the screen is TURNED OFF (command run
  via adb). When the screen is on, this figure is much higher and
  sometimes rises up to 60%.

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