Comment 30 for bug 1563287

Bisected. As kdub suggested, the regression occurred at lp:mir r3297. Mir's compositor report shows (running 5 triangles on krillin):

r3296: 1.8ms/frame
r3297: 35.0ms/frame

------------------------------------------------------------
revno: 3297 [merge]
author: Kevin DuBois <email address hidden>
committer: Tarmac
branch nick: development-branch
timestamp: Tue 2016-02-09 17:07:23 +0000
message:
  repropose already landed branch introducing sync fences
  (https://code.launchpad.net/~kdub/mir/egl-sync-fences/+merge/278181)
  while avoiding the mx4/powervr regression that caused its reversion.

  fixes: LP: #1517205. Fixes: https://bugs.launchpad.net/bugs/1517205.

  Approved by PS Jenkins bot, Alexandros Frantzis, mir-ci-bot, Alan Griffiths.
------------------------------------------------------------