[Bug 109943]

[PeterPall]

This user chrome is a real battery saver! Thanks! ...and the throbber in the mouse pointer still tells me if thunderbird is busy.
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If I understand this right we now have 2 things that are rendered in the same thread and that use 100% of one CPU (indicated as 50% of the CPU power of a 2-CPU-System, 20% of the CPU power of a 5-cpu-system and 12,5% of the CPU power of an 8-cpu one) if they get the chance of doing so. ...or was the progress meter a Red Herring and it was only the throbber all along?

100% of one CPU normally doesn't indicate that something is amiss: The
CPU could be asleep 99% of the time and be busy 1% of the remaining
time. But the battery drain throbber+progress meter and generate seems
to indicate that the CPU won't sleep while there is indeterminate
progress...

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

Title:
  Thunderbird: high CPU usage from progress bars

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