Public bug reported:

Ubuntu Release: 14.04.1 LTS
Enigmail version: 1.7-0ubuntu0.14.04.1
Thunderbird version: 31.0+build1-0ubuntu0.14.04.1

My Thunderbird/Enigmail setup was working perfectly well until the
recent update. Now, whenever I enter an IMAP inbox subfolder I can
navigate to the first message just fine, but as soon as I click another
message the CPU spikes to 100% and the UI freezes for a few minutes
before returning. However, as soon as I begin to click around again, I
get the same thing again. It's quite unusable. In addition, I seem to be
able to click around in messages within the inbox just fine without a
freeze, but as soon as I leave the message list pane to do something
else, I get a freeze. None of this behavior occurs if I disable the
Enigmail extension. I tried using a new Thunderbird profile, but that
didn't change anything. I'm not sure what kind of diagnostics would be
useful here, but I would be happy to provide.

** Affects: enigmail (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  Ubuntu Release: 14.04.1 LTS
  Enigmail version: 1.7-0ubuntu0.14.04.1
  Thunderbird version: 31.0+build1-0ubuntu0.14.04.1
  
  My Thunderbird/Enigmail setup was working perfectly well until the
  recent update. Now, whenever I enter an IMAP inbox subfolder I can
  navigate to the first message just fine, but as soon as I click another
  message the CPU spikes to 100% and the UI freezes for a few minutes
  before returning. However, as soon as I begin to click around again, I
  get the same thing again. It's quite unusable. In addition, I seem to be
  able to click around in messages within the inbox just fine without a
  freeze, but as soon as I leave the message list pane to do something
  else, I get a freeze. None of this behavior occurs if I disable the
- Enigmail extension. I'm not sure what kind of diagnostics would be
+ Enigmail extension. I tried using a new Thunderbird profile, but that
+ didn't change anything. I'm not sure what kind of diagnostics would be
  useful here, but I would be happy to provide.

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https://bugs.launchpad.net/bugs/1349179

Title:
  Frequent temporary UI freezes and 100% CPU usage

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