[Bug 109943]

[dvo]

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

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