Tbird is 'not responding' now for up to 30 seconds. Is anyone trying to fix that?
Nothing to add; fixes for the widespread kerrnel secuirty issues have slowed everything down, but Tbird has slowed down, at random, much more.
Chosen solution
I realised that Thunderbird has a 'safe mode' as well as Windows. The latter didn't help, but the former gave an instant solution! I found Lightning in the list of Problem Extensions. I don't recall how it got there, but removing it seems to have fixed the problem, not only for Thunderbird but other programs were sticking and that seems to have stopped.
I will investigate SUMO.
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What is your anti-virus software?
I have AVG Internet Security, paid up and updated. I have asked AVG if they have any issues with Tbird and they say they have not.
Try to start Windows in safe mode with networking enabled. - Win10 https://support.microsoft.com/en-us/help/12376/windows-10-start-your-pc-in-safe-mode
Still in Windows safe mode, start Thunderbird in safe mode. - https://support.mozilla.org/kb/safe-mode
Does the problem go away?
I've been all through this before. It hasn't produced a solution. The problem seems much less frequent, but in any case the frequncy varies in normal operation from day to day anyway
See if this article helps. https://wiki.mozilla.org/Thunderbird:Testing:Memory_Usage_Problems
Thank you. It will take me a long time to work through all those possibilities.
johnwoo3 said
Thank you. It will take me a long time to work through all those possibilities.
Thanks. Please post your results
Chosen Solution
I realised that Thunderbird has a 'safe mode' as well as Windows. The latter didn't help, but the former gave an instant solution! I found Lightning in the list of Problem Extensions. I don't recall how it got there, but removing it seems to have fixed the problem, not only for Thunderbird but other programs were sticking and that seems to have stopped.
I will investigate SUMO.