Same problem here on Linux Mate 19.3 with Xed and Ibus using large
amounts (up to 200 %) of CPU usage. Opening system monitor or htop stops
the problem temporarily.

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https://bugs.launchpad.net/bugs/1766503

Title:
  ibus-* randomly use high CPU

Status in The Ubuntu Power Consumption Project:
  Confirmed
Status in ibus package in Ubuntu:
  Confirmed

Bug description:
  ibus-* randomly use high CPU in Ubuntu 18.04

  In fact, I think it's now using more CPU overall than the shell itself
  is to redraw a 4K screen:

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND   
  
   3308 dan       20   0 4009804 192676  84804 R  45.7  2.4   1:13.65 
gnome-shell 
   3352 dan       20   0  384364  26796  20552 S  13.9  0.3   0:22.81 ibus-x11  
  
   3372 dan       20   0  217944  10620   7764 S  10.9  0.1   0:16.20 
ibus-engin+ 
   3350 dan       20   0  293828  10384   7516 R  10.6  0.1   0:16.54 
ibus-dconf  
   3346 dan       20   0  374572  11944   8268 S  10.3  0.1   0:15.93 
ibus-daemon

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ibus 1.5.17-3ubuntu4
  ProcVersionSignature: Ubuntu 4.15.0-19.20-generic 4.15.17
  Uname: Linux 4.15.0-19-generic x86_64
  ApportVersion: 2.20.9-0ubuntu6
  Architecture: amd64
  Date: Tue Apr 24 15:29:07 2018
  InstallationDate: Installed on 2017-12-12 (133 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20171211)
  SourcePackage: ibus
  UpgradeStatus: No upgrade log present (probably fresh install)

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