Just from my own experience, some bugs sit for years and years. It's not that nobody cares; it's that there are many bugs and many priorities. I'm not speaking officially, but just as another user on the forum. If critical to many people and easy, then it gets fixed quickly, but I see that you have been the primary contributor to this. This is just my observation. There is, to my knowledge, no one person who can answer your question on how quickly this will be addressed.

Thanks. I just hope to see a change in the triaged status soon!

Have you tried the steps in this article. https://wiki.mozilla.org/Thunderbird:Testing:Memory_Usage_Problems

I know it say memory usage, but it is entirely appropriate here.

I suggested the safe mode steps in your bug report.

Thanks Matt,

I'll check on those items. However, I obviously have exactly the same OS and other settings between 115 and rolling back to 102, which instantly and completely fixed the problem, so on a differential diagnosis basis, I'd say it was highly unlikely to be anything outside TB. Mine is not a case of TB being generally slow, it's a highly specific use of TB in terms of displaying the selected message content. Such a major update as 115 has probably changed the way in which a mail folder is indexed or parsed resulting in a clear folder-size-related delay whilst it's working hard to do something, and raising the CPU.

Obviously, TB 115 may interact with the OS etc differently causing this, so I will look at those troubleshooting items in due course.

I did see somewhere that over time TB has used two different folder/file/mail structures and wondered what these were, how to recognise them, and I can see if the problem exists on both types of structure. If true, my mailbase is so old it is bound to have both types. Any ideas?

9 days untriaged is not very long. And it's not a severe issue, so may not get serious attention for a while. In the bug report you listed old bug reports that match, but obviously you would want to focus on version 115 reports https://mzl.la/3ShFwCS

I am still waiting for any response at all to Bug 1860647 reported 5 months ago, apart from a number of people saying "me too". No change in v115.9.0 and still shown "Untriaged" in Bugzilla.

Anyone here who can move it on?

This is about Ctrl +/- having no effect when reading a mail without first selecting the View menu and exiting it.