Public bug reported:

Both VMs that I upgraded to Xenial experience constant high cpu usage,
and top reports compiz is by far the high user of cpu.

The high cpu usage is more apparent from outside the machine, were host
reports guests are using close (or over at times) to 200% cpu, than in
the guests which are reporting 60-100% cpu (multicore VM) for compiz,
constantly.

The VMs are using the QXL video driver and are using a spice channel for
virt-manager / virt-viewer.

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1571918

Title:
  Constant high cpu usage in xenial under qxl/spice

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