Help diagnosing lightnig performance issues

Thunderbird
#1

Hi there,

On my current machine, opening Lightning’s monthly view takes about 50 seconds. I have 4 calendar subscriptions, with about 50 events.

What’s the right way to profile Thunderbid to find the culprit?

Thanks!

#2

What version of Thunderbird?

#3

68.8.0; I’m on Linux Mint 19.3, which is based on Ubuntu 18.04

#4

Clément, Sorry for the lack of reply.

Performance improvements are beginning, but they will be happening in version 78. So if you are not using the enigmail addon, I would encourage you to update late next week to 78.2.0 from https://www.thunderbird.net/en-US/

#5

Hi @wsmwk!

Thanks for your reply. I am now on 78.7.1. The lags are still here; they seem worse than before, but it’s hard to say. When I open the calendar tab, all of Thunderbird freezes for 2 to 5 minutes. This does not happen every time I open the calendar, but it happens very often. Often moving from the mail tab to the calendar tab and back is enough.

Any chance I could help diagnose this locally? With a standard build, the backtraces aren’t exactly useful:

(gdb) bt
#0  0x00007f9ccae4a719 in  () at /usr/lib/thunderbird/libxul.so
#1  0x00007f9ccae33263 in  () at /usr/lib/thunderbird/libxul.so
#2  0x00007f9cca9e9d31 in  () at /usr/lib/thunderbird/libxul.so
#3  0x00007f9ccae37254 in  () at /usr/lib/thunderbird/libxul.so
#4  0x00007f9ccae36e51 in  () at /usr/lib/thunderbird/libxul.so
#5  0x00007f9ccae20e86 in  () at /usr/lib/thunderbird/libxul.so
#6  0x00007f9ccae2295b in  () at /usr/lib/thunderbird/libxul.so
#7  0x00007f9ccae23a63 in  () at /usr/lib/thunderbird/libxul.so
#8  0x00007f9ccae24287 in  () at /usr/lib/thunderbird/libxul.so
#9  0x00007f9ccae144ee in  () at /usr/lib/thunderbird/libxul.so
#10 0x00007f9ccae02228 in  () at /usr/lib/thunderbird/libxul.so
#11 0x00007f9ccabd9526 in  () at /usr/lib/thunderbird/libxul.so
#12 0x00007f9ccac85b92 in  () at /usr/lib/thunderbird/libxul.so
#13 0x00002994a36a9d6a in  ()
#14 0x00002994a36a3350 in  ()
#15 0x00007ffeb6a38168 in  ()
#16 0x0000393aafd1f100 in  ()
#17 0x0000000000000000 in  ()
#6

OK, I collected a profile: https://share.firefox.dev/31P08sx

It looks like Thunderbird is spending 90 seconds in getSubscriptionsDS and 30 seconds in GC, and Thunderbird reports a 104 seconds event-processing delay.

Let me know if I can help further.