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[Pablo180 <968533@xxxxxxxxxxxxxxxxxx>]

Jesse, I admit I am by no means an expert, but I don't understand,
surely it is the same problem with the same causes and symptoms, but
just with a different workaround?

I don't really see how 13.04 makes any difference now anyway, it hasn't
been fixed and it certainly won't be fixed for 13.04; support for that
release ends in three months if it hasn't in all practicality ended
already?

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https://bugs.launchpad.net/bugs/968533

Title:
  Alt-tab to Firefox sends Firefox to 100% CPU; unity-panel-service to
  80% CPU and hud-service to 20-80% CPU

Status in Unity:
  Confirmed
Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  I've been seeing UI hangs after switching tabs in Firefox, and
  switching from other applications to Firefox.

  It can take 3-8 seconds to change *tab*.  During this time the CPU is
  maxed out;  typical output from 'top' during this period shows 'hud-
  service' and 'unity-panel-service' combined using about the same CPU
  as Firefox itself:

   100 10.4  26:07.73 firefox            
    53  0.6   6:14.86 hud-service        
    38  1.5   6:42.14 unity-panel-service

  I suspect that the change is causing a (an inefficient) re-index
  related to updated menu structures.  (Eg. something like the history
  menu, although I can't see what it is as don't currently have a menu
  bar).

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