Also confirmed that OTA-10 images 31 and 32 are slow only in the spread,
and only with a few windows or more.

The Mir performance report for Unity8 is showing smooth performance in
Unity8 other than a well populated spread. In fact, performance of the
spread varies dynamically according to the number of windows in it.

If you view the top of the window stack then you get 4-5 windows visible
and it's slow and stuttery. If you go to the bottom of the stack though
and wiggle your finger, it becomes fast again -- because at the bottom
of the stack only two windows come into view simultaneously.

So the regression is probably somewhere between Unity8 and QtMir, where
our ability to put multiple surfaces on screen at once has degraded.

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https://bugs.launchpad.net/bugs/1563287

Title:
  [regression] [OTA-10] Right edge switcher stutters badly with only a
  few apps opened

Status in Canonical System Image:
  Confirmed
Status in Mir:
  New
Status in QtMir:
  New
Status in qtmir package in Ubuntu:
  Confirmed
Status in unity8 package in Ubuntu:
  Confirmed

Bug description:
  Regression in OTA-10:
  tested on krillin and arale on rc-proposed.
  also I tried the fix for bug 1556763 but that's not related to this as well.

  The right edge switcher on both krillin and arale stutter when I drag
  it from the right edge and then swipe through the list of opened
  windows.

  This was not the case a few months ago, so we clearly regressed here.

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