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[LA <radiobuzzer@xxxxxxxxxxxx>]

The issue has a misleading title. The issue occurs generally when
hitting the ALT key. I confirmed with Firefox 23 on Ubuntu 12.10. Lately
the unity menu integration does not come as an addon. So, the previous
solution (to disable the globalmenu addon if ones has high CPU load)
does not work.

I found another solution, which is not optimal, but solves the problem
to a certain usable extent. The problem was that there were hundreds of
bookmarks in the bookmarks menu and the bookmarks toolbar. Some of them
were dynamic RSS bookmarks, which means that they kept growing by the
time. So HUD had to index all these bookmarks.

The solution was to move all the useless bookmarks from the bookmarks
menu to the "unsorted bookmarks". The latter do not appear in the menu
and therefore do not have to be indexed by HUD. After I did this, still
HUD requires a little bit of loading, but it is much faster and, most
important, does not halt the entire system.

I still believe there is an issue with HUD here: the entire adventure
with the hundred features indicates to me that HUD's indexing is sub-
optimal: it keeps re-indexing the same things that have already been
indexed before, probably there is no (sufficient) caching or so. Another
possibility could be a limit on the number of the bookmark items being
indexed by HUD.

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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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