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On 2021-09-12T20:52:35+00:00 Adm-e wrote:

User Agent: Mozilla/5.0 (Windows NT 6.2; Win64; x64; rv:68.0)
Gecko/20100101 Firefox/68.0

Steps to reproduce:

My Linux Arch/Manjaro TB package was just upgraded:
78.14.0-0.1 -> 91.1.0-0.1
and immediately i have noticed the new feature/issue:
in the unified Inbox i am moving mouse up/down quickly through the list of 
e-mails and i can see that the line the mouse is on is highlighted with delay, 
meaning that this highlight action may be not optimized/badly made or CPU heavy.
And i think that my XFCE tray CPU usage meter is showing that the CPU usage 
rise when i move the mouse through the list of e-mails.
I can confirm this by running "htop" in terminal, F4, type "thund", enter now 
move cursor in thunderbird and i can see that the CPU usage of the 
/usr/lib/thunderbird/thunderbird jumps from 2% of the CPU core to the 30-60% of 
the CPU core.



Expected results:

Feature optimized to have nearly no performance impact or removed.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/0

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On 2021-09-12T20:55:33+00:00 Adm-e wrote:

this stupid system does not allow me to adjust what i have just posted
(possibly admin or creators wants to waste the time of the developers)

unified Inbox -> TB/View/Folders/Unified
but the issue happen also in normal folders.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/1

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On 2021-09-13T00:08:57+00:00 Vseerror wrote:

Please create a profile using https://support.mozilla.org/en-
US/kb/profiling-thunderbird-performance

Thanks

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/2

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On 2021-09-13T17:00:58+00:00 Adm-e wrote:

I am not willing to publish it here for privacy reason. If anyone is
able to fix the issue and is unable to reproduce it, then let me know
the private contact and i will try to provide the detail.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/3

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On 2021-09-14T00:47:53+00:00 Vseerror wrote:

(In reply to 794632548 from comment #0)
> User Agent: Mozilla/5.0 (Windows NT 6.2; Win64; x64; rv:68.0) Gecko/20100101 
> Firefox/68.0
> 
> Steps to reproduce:
> 
> My Linux Arch/Manjaro TB package was just upgraded:
> 78.14.0-0.1 -> 91.1.0-0.1
> and immediately i have noticed the new feature/issue:
> in the unified Inbox i am moving mouse up/down quickly through the list of 
> e-mails and i can see that the line the mouse is on is highlighted with 
> delay, meaning that this highlight action may be not optimized/badly made or 
> CPU heavy.
> And i think that my XFCE tray CPU usage meter is showing that the CPU usage 
> rise when i move the mouse through the list of e-mails.

arnauld, can you reproduce this?

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/4

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On 2021-09-14T10:39:47+00:00 Arnauld-s wrote:

(In reply to Wayne Mery (:wsmwk) from comment #4)
> arnauld, can you reproduce this?

Hello,

Laptop hp OS: Manjaro 21.1.2 Pahvo / Kernel: x86_64 Linux 4.19.205-1-MANJARO
CPU: Intel Core i3 M 330 @ 4x 2.133GHz GPU: NVA8 RAM: 2396MiB / 3870MiB
TB: 91.1.0 (64-bit)

> in the unified Inbox i am moving mouse up/down quickly through the
list of e-mails and i can see that the line the mouse is on is >
highlighted with delay, meaning that this highlight action may be not
optimized/badly made or CPU heavy.

For me I have no problems, I move the mouse up/down/highlighted quickly
with no delay at all.

> And i think that my XFCE tray CPU usage meter is showing that the CPU
usage rise when i move the mouse through the list of e-mails.

When I move the mouse quickly through the list of e-mails my TB CPU
usage is between 1 to 30%.

So everything is working fine for me, no problems at all.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/5

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On 2021-09-14T16:31:58+00:00 Adm-e wrote:

I wanted to post a proof video what i am doing and the issue i am
seeing, [here please](https://streamable.com/xocz74)

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/6

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On 2021-09-23T12:39:45+00:00 Debaser-1 wrote:

Related concerns found in [Archlinux
forum](https://bbs.archlinux.org/viewtopic.php?pid=1994387) and [Reddit
r/Thunderbird](https://old.reddit.com/r/Thunderbird/comments/ppnb5g/thunderbird_91_significantly_slower/).

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/7

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On 2021-09-23T17:56:11+00:00 Debaser-1 wrote:

https://share.firefox.dev/3ENDDXi

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/8

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On 2021-09-24T06:24:27+00:00 Atlantida wrote:

ya I'm seeing this also.  Thunderbird hangs for a few seconds when
selecting an email and scrolling down the body.  It happens initially
then seems to be ok.  It's almost reproducible...  just click on another
email, click back to the original, and try scrolling down.  Do this
until it occurs again.  This also triggers an error:

IPDL protocol error: Handler returned error code!

###!!! [Parent][DispatchAsyncMessage] Error:
PClientManager::Msg_ExpectFutureClientSource Processing error: message
was deserialized, but the handler returned false (indicating failure)

Other errors include:

ERROR style::stylesheets::rule_parser] Saw @import rule, but no way to
trigger the load

(xfce4-panel:659): xfce4-panel-CRITICAL **: 18:26:19.276: panel-window.c:2391 
(panel_window_active_window_geometry_changed): expression 'WNCK_IS_WINDOW 
(active_window)' failed.
JavaScript error: resource:///modules/AddrBookCard.jsm, line 166: 
NS_ERROR_NOT_AVAILABLE: PreferDisplayName: undefined - not a boolean

The later actually causes my display to go black for a few seconds!!!
Could be unrelated, but only happens when launching thunderbird.
Effects v91.1.0 and up.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/9

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On 2021-09-24T07:54:39+00:00 Atlantida wrote:

This one also:

JavaScript error: resource://gre/modules/ActivityManager.jsm, line 129:
NS_ERROR_NOT_AVAILABLE:

This is on Arch (XFCE).

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/10

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On 2021-09-27T10:14:05+00:00 Cdcwvbjibv wrote:

I have the same problem and I'm running Thunderbird on Windows 7 x64.
Previous major version (78.X) worked without a problem.

When moving the mouse cursor over the emails in the message list pane,
the highlight effect considerably lags behind the cursor (similar to the
video posted by the reporter). Checking the Task Manager shows two
Thunderbird processes jump to a combined CPU usage of 60-80 % (the first
process takes 50-70 % and the second between 10-20 %).

Computer: CPU: Intel Q6600 @ 2.4 GHz / 8 GB RAM / GPU: Radeon HD 5850 1 GB VRAM 
/ Windows 7 x64
TB: 91.1.1 (32-bit)

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/11

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On 2021-10-02T03:09:29+00:00 Vseerror wrote:

Changing severity to S3 because of modest performance

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/12

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On 2021-10-04T11:24:44+00:00 B-fabian wrote:

I see at least two reports confirming this in Mozilla Thunderbird
support, including Windows, Mac and GNU/Linux - and I have the same
problem (TB 91.1.2 on Windows 10).

This makes Thunderbird slow to the point it can't be used normally.

A possible workaround was mentioned here : 
https://support.mozilla.org/en-US/questions/1347196#answer-1435915

> If I go to preferences --> config editor and search for the entries:
> 
>    gfx.webrender.all
>    gfx.webrender.force-disabled 
> 
> Switch the first one to false (it was already switched to false) and the 
> second one to true (I switched this one manually) 
> everything works smooths and no cpu usage jumps happen. 

I suggest raising importance/severity. People upgrading seldom backup
their Thunderbird profile and when this happens, all the usual
"Thunderbird is slow" are being tried without a solution, bringing a
user closer to stop using Thunderbird and go to other options.

A few references to people reporting this problem :

* https://support.mozilla.org/en-US/questions/1347196
* https://support.mozilla.org/en-US/questions/1351874

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/13

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On 2021-10-04T11:32:38+00:00 B-fabian wrote:

More reports :

* 
https://www.reddit.com/r/Thunderbird/comments/ppnb5g/thunderbird_91_significantly_slower/
* https://bbs.archlinux.org/viewtopic.php?pid=1992824

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/14

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On 2021-10-05T00:05:24+00:00 Sfoerster42 wrote:

The workaround worked for me (GNU/Linux).

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/15

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On 2021-10-05T09:31:33+00:00 2-axel wrote:

Same problem Thunderbird 91.1.2 on macOS 11.6, i7, 32GB.
Just moving the mouse over folder entries, without clicking, was so slow it was 
unusable.
Workaround worked for me as well.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/16

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On 2021-10-11T13:39:56+00:00 Completelyrandom+github wrote:

I was the author of the previously mentioned thread in the ArchLinux
forum (comment
[#7](https://bugzilla.mozilla.org/show_bug.cgi?id=1730423#c7) and
[#14](https://bugzilla.mozilla.org/show_bug.cgi?id=1730423#c14)).

Just dropping by to confirm: The workaround quoted in comment 
[#13](https://bugzilla.mozilla.org/show_bug.cgi?id=1730423#c13) works for me.
After changing the two values, Thunderbird's idle CPU usage drops below 1 % 
according to htop and sits (close) to 0 % frequently. When hovering over 
e-mails or folders, no significant increase of CPU load can be observed.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/17

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On 2021-10-12T20:45:28+00:00 Bugzilla-mozilla-org wrote:

On my 4.2GHz i7 running Fedora 34 I regularly (20-30 times in an 8-hour
day) have the UI freeze until GNOME's "application not responding, wait
or kill" message appears. I'd respectfully suggest S3 is much too low.

thunderbird/thunderbird-wayland 91.1.0-1.fc34.x86_64 (installed from
RPM).

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/18

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On 2021-10-13T01:38:05+00:00 Buhrt wrote:

The workaround seems to 'fix' Thunderbird 91.1.0 Fedora 34
(thunderbird-91.1.0-1.fc34.x86_64). I ran the performance profiler
before the change with and without add-ons enabled and saved the
respective json files along with screenshots from the 3 profiler tabs if
anyone wants/needs them.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/19

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On 2021-10-19T03:26:29+00:00 Vseerror wrote:

Confirming based on multiple reports.  But the resolution likely must
come from the removal of xul in bug 1724841 (which won't happen until
next year), or in combination of a graphic fix by firefox core
developers (based on a performance profile, as mentioned in bug
1697999).

Does anyone have a workaround that has webrender enabled but some sub
functionality disabled?

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/20

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On 2021-10-20T09:55:29+00:00 Cdcwvbjibv wrote:

Reporting on additional unwanted behavior which doesn't get resolved
using the workaround mentioned in comment
[#13](https://bugzilla.mozilla.org/show_bug.cgi?id=1730423#c13).

The same high lag and slowness is noticed when scrolling through the
e-mail/message list pane, either using the mouse scroll wheel or the
scroll bar.

Running on Windows 7 x64, TB version: 91.2.0(32-bit).

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/21

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On 2021-10-20T09:57:50+00:00 Cdcwvbjibv wrote:

(In reply to cdcwvbjibv from comment #21)
> Reporting on additional unwanted behavior which doesn't get resolved using 
> the workaround mentioned in comment 
> [#13](https://bugzilla.mozilla.org/show_bug.cgi?id=1730423#c13).
> 
> The same high lag and slowness is noticed when scrolling through the 
> e-mail/message list pane, either using the mouse scroll wheel or the scroll 
> bar.
> 
> Running on Windows 7 x64, TB version: 91.2.0(32-bit).

Correction.

Running on Windows 7 x64, TB version: 91.2.0 (64-bit).

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/22

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On 2022-02-02T08:42:26+00:00 Daniel van Vugt wrote:

Downstream Ubuntu bug: https://launchpad.net/bugs/1959747

Reply at:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1959747/comments/24


** Changed in: thunderbird
       Status: Unknown => Confirmed

-- 
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/1959747

Title:
  [upstream] Very high CPU and slow responsiveness in Thunderbird 91.5.0

Status in Mozilla Thunderbird:
  Confirmed
Status in thunderbird package in Ubuntu:
  Triaged

Bug description:
  Very high CPU and slow responsiveness in Thunderbird 91.5.0. Just
  moving the mouse cursor over a message list results in 365% CPU for
  me.

  I had to set this in the config editor to fix it:

    gfx.webrender.force-disabled = TRUE

  Upstream bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1730423

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