[Bug 987060] Re: massive memory leak in unity-panel-service and hud-service when invoking the hud on Firefox profiles with large amounts of bookmarks LTS 12.04 14.04

[Dave Barker]

The problem for me seemed to have been caused by having a single very
large PDF on my Desktop. Even after stopping hud-service from executing
I noticed that nautilus was consistently using 15% of one CPU core, but
as soon as I moved that PDF somewhere else the problem went away. I've
now allowed hud-service to run again, rebooted, and things appear to be
working nicely again.

Observations:

 - Why is generating the preview icon for a large PDF so costly? Surely only the first page should be read and used for that purpose?
 - Surely these preview icons should be cached?
 - I think even if generating the preview icon is expected to be costly, there is a bug here as there is definitely a memory leak + the CPU usage stayed consistently high for hours. Surely the process should finish and then the CPU usage should drop away again?

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Title:
  massive memory leak in unity-panel-service and hud-service when
  invoking the hud on Firefox profiles with large amounts of bookmarks
  LTS 12.04 14.04

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