(In reply to Niklas Hambüchen from comment #65)
> I have already tested that.
>
> * Only throbber: ~15-20% CPU usage
> * Only progress bar: ~15-20% CPU usage
> * Both throbber and progress bar: ~15-20% CPU usage
> * Both disabled: no CPU usage
Strange that both together use the same CPU like when only one is
active.
Please could you try
```
.tab-throbber[busy] {
list-style-image: none !important;
}
```
Then I can see if the animated PNG is the cause of the CPU usage.
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https://bugs.launchpad.net/bugs/109943
Title:
Thunderbird: high CPU usage from progress bars
Status in Mozilla Thunderbird:
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/thunderbird/+bug/109943/+subscriptions
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