**Workaround:**
I found that disabling the indeterminate progress progress bar is not
enough; the spinning throbber in the tab is also responsible for CPU
usage.
I'm using the below in my Thunderbird profile folder's
`chrome/userChrome.css` to disable both, resulting in the 15-20% CPU
usage disappearing:
@namespace
url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";);
/* nh2: Progress bar CPU usage fix. */
/* For some stupid reason we can't match the html:progress that's the first
child of this container.
See https://bugzilla.mozilla.org/show_bug.cgi?id=562977#c61
So we can't style the progress bar so that it does doesn't get shown
only when
indeterminate (which takes the most CPU), or style it to render faster.
So for now we hide the entire parent container, thus getting rid of the
progress bar entirely.
*/
#statusbar-progresspanel {
display: none;
}
/* nh2: Tab throbber animations also take a lot of CPU; hide them.
Unfortunately I didn't find a way to replace them by a static image.
*/
.tab-throbber[busy] {
display: none !important;
}
.tab-throbber[progress] {
display: none !important;
}
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to thunderbird in Ubuntu.
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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