More info:
I've noticed this time it happened right after closing a Gnome terminal.
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https://bugs.launchpad.net/bugs/1248260
Title:
ibus-daemon hogging resources
To manage
Public bug reported:
At times, typing becomes very sluggish and I can see ibus-daemon becomes
the process consuming most CPU and most memory in the system.
Everything else is responsive, i.e. mouse
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: ibus 1.5.3-6ubuntu2
ProcVersionSignature: