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[dvo <109943@xxxxxxxxxxxxxxxxxx>]

Thanks Wayne for bringing attention back also to this bug.

I can confirm that the bug still exists with the latest released TB
version 31.3.0 with a cpu usage increase of about 12-13% on my Macbook
Air. As I wrote recently in response on your request regarding the
(likely related) bug 919485, unfortunately I cannot afford the time to
install the trunk version and use profiling tools. Yet anyone interested
could do for himself easily, since this bug can be reproduced in a
straightforward way: put any garbage IP address as e.g. the IMAP (or POP
or SMTP) server name and try receiving (or sending, respectively)
emails.

I suspect that this waste of CPU (and battery on mobile devices!) is due
to the same careless chunk of code performing a busy loop somewhere deep
in Mozilla's TCP client connect implementation.

BTW, the title of this bug report is misleading, as it is too narrow:
the misbehavior also occurs without any progress bar being shown, e.g.,
when trying to fetch emails.

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https://bugs.launchpad.net/bugs/109943

Title:
  Thunderbird: high CPU usage from progress bars

Status in Mozilla Thunderbird Mail and News:
  Confirmed
Status in thunderbird package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: mozilla-thunderbird

  When sending a simple and short email with Thunderbird via SMTP the
  CPU is used intensively. This seems not to be necessary. If the
  sending failed and an corresponding error message dialog appears, the
  CPU is still being used. When pressing ok to close the error dialog
  the CPU is fine. This suggests it might be related specifically to the
  progress bar.  Such behavior is especially annoying on a laptop where
  you can hear the CPU usage because of a starting fan.

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