On my netbook, I can get it up to 35% cpu (of one core).
That has two Intel Atom CPU N450 @ 1.66Ghz.
At my normal typing speed, it uses 11% on the netbook.

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https://bugs.launchpad.net/bugs/1335373

Title:
  ibus uses too much cpu while typing

Status in “ibus” package in Ubuntu:
  New

Bug description:
  What steps will reproduce the problem?

  1. type random stuff fast in a terminal
  2. ibus hogs 15% of a core - Intel Core i7-3610QM CPU @ 2.30GHz
  3. this is much more CPU than recordmydesktop needs to record it!

  What is the expected output? What do you see instead?

  I expect this thing to forward my ASCII keystrokes to my terminal
  without eating 15% of a core.

  I uploaded a youtube video to express my disgust with this program's
  ridiculously bad performance.
  https://www.youtube.com/watch?v=XPJs0pGOhxo

  Maybe this ibus component is the second coming of Jesus for people who
  speak Chinese.  If so, great.  As for me, I don't need other input
  methods very much, I just want plain normal ASCII input to get through
  to my programs efficiently.

  unity-control-center depends on ibus. You should not have let this
  thing into stable with its absolutely atrocious performance. In my
  opinion it should not be in Debian stable either; atrocious
  performance is a serious fault.

  I do not expect operating system components to perform as if they were
  written by grade school children.  Can you fix this thing to not suck,
  please?  Or get rid of it.  Or at least get rid of the dependency on
  it.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ibus 1.5.5-1ubuntu3
  ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
  Uname: Linux 3.13.0-29-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sat Jun 28 13:34:34 2014
  InstallationDate: Installed on 2012-06-05 (752 days ago)
  InstallationMedia: Linux Mint 13 "Maya" - Release amd64 (20120520)
  SourcePackage: ibus
  UpgradeStatus: No upgrade log present (probably fresh install)

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