Hi,

Am 21.11.24 um 01:50 schrieb MV:

Thunderbird has an important CPU usage (100% on one core).

This usage stops when I restart thunderbird whether in normal or safe mode.

I would like to know how to diagnose this CPU usage.

we've collected the basic steps to dig into debugging within the Debian wiki.

https://wiki.debian.org/Thunderbird#Bug_Reporting_.2F_Issues

Most likely you have a AddOn installed that is producing this behavior I'd guess.

Another user has provided this in a similar case:

Starting TB from the command line with `thunderbird --safemode` showed

"[GFX1-] RenderCompositorSWGL failed mapping default framebuffer, no dt".

That smelled strongly like broken Java, which meant I'm in over my head. I
had noticed in
"https://support.mozilla.org/en-US/questions/1385881#answer-1527621"; a tip
to remove 3 files in the TB .profile directory. I did that by
(non-destructively) moving them from filename to filename.NO. The 3 files
were: session.json xulstore.json and folderTree.json. After starting
"normally" and setting up my 3 windowpanes (folders/calendar/adressbook) aas
wanted, I could start & stop TB without a problem.

Maybe that is also helping.

--
Regards
Carsten

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