*** This bug is a duplicate of bug 968533 ***
    https://bugs.launchpad.net/bugs/968533

The issue is still active and it is not a duplicate. 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 that 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/1005174

Title:
  HUD Service high CPU usage with Firefox

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