** Branch linked: lp:~ci-train-bot/mir/mir-ubuntu-zesty-2369

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https://bugs.launchpad.net/bugs/1651638

Title:
  [regression] Latency for fullscreen interval 0 clients (e.g. games and
  benchmarks) increased with the introduction of nested passthrough

Status in Mir:
  Fix Committed
Status in Mir 0.25 series:
  Triaged
Status in mir package in Ubuntu:
  New

Bug description:
  Nested fullscreen interval 0 clients in Mir 0.25.0 had higher latency
  than interval 1 nested fullscreen clients.

  I've reproduced this a couple of times and it is concerning:

  Mir 0.25:
     Interval 0: 81ms  <-- regression
     Interval 1: 64ms  <-- improvement

  Mir 0.24:
     Interval 0: 70ms
     Interval 1: 96ms

  It's the obvious green spike in this chart:
  
https://docs.google.com/spreadsheets/d/1RbTVDbx04ohkF4-md3wAlgmxbSI1DttstnT6xdcXhZQ/pubchart?oid=1566479835&format=interactive

  Although this regression appears to be resolved in the 0.26 series
  (lp:mir) it's serious enough that we should look into finding what the
  cause was so that Mir 0.25.1 can get the same fix.

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