** Branch linked: lp:~ci-train-bot/mir/mir-ubuntu-yakkety-landing-036

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https://bugs.launchpad.net/bugs/1579076

Title:
  [regression] NBS causes sudden loss of performance after surface
  resizes

Status in Mir:
  Fix Committed
Status in Mir 0.23 series:
  Fix Released
Status in Mir 0.24 series:
  Fix Committed
Status in mir package in Ubuntu:
  Fix Released

Bug description:
  Seems that the dash gets resized() very shortly after its created.
  This seems to cause a degradation from "triple-buffered" operation to
  "double-buffered" operation. On some device loads (eg, krillin+dash,
  where the rendering needs to be triple buffering to stay at vsync
  rate), this can cause the performance to dip

  tagging as critical, as it should block 0.23.

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