** Merge proposal linked:
   https://code.launchpad.net/~3v1n0/ubuntu/+source/gjs/+git/gjs/+merge/361167

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https://bugs.launchpad.net/bugs/1803271

Title:
  [regression] Much higher CPU during some gnome-shell operations

Status in gjs package in Ubuntu:
  Fix Released
Status in gjs source package in Bionic:
  Triaged
Status in gjs source package in Cosmic:
  Fix Released

Bug description:
  [Impact]

  Since fixing bug 1672297 in release 18.04 we experience much higher (almost 
double) CPU usage during gnome-shell JavaScript operations, such as the icon 
spring animation [1]. Even just moving the mouse is a little more expensive now 
[2].
  [1] https://gitlab.gnome.org/GNOME/gnome-shell/issues/349
  [2] https://gitlab.gnome.org/GNOME/mutter/issues/283

  [Test Case]

  Use 'top' to measure the CPU usage of the gnome-shell process while
  tapping Super+A repeatedly. It should be much lower with the fix than
  without.

  [Regression Potential]

  Low. This particular fix is tiny
  (https://gitlab.gnome.org/GNOME/gjs/merge_requests/236) and has been
  released and used in a couple of upstream gjs versions already without
  issue.

  [Other Info]

  The fix is already released to 19.04 as part of gjs version 1.54.2-1.
  And already released to 18.10 as part of gjs version
  1.54.3-1~ubuntu18.10.1.

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