** Description changed:

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

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

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