I don’t think large threads are a problem in my case. Unless they are in issue with background processing? I just opened a large email thread (11 messages) and response from the UI was normal. In general, I’m not experiencing any UI slow downs.
I’m just observing the mail sync log and it seems normal. I do see the following, is it a concern?
3332 [2021-03-01 14:59:24.867] [background] [warning] [SLOW] Transaction=saveFolderStatus > 80ms (831ms, 830 waiting to aquire)
3332 [2021-03-01 14:59:24.867] [background] [info] Sync loop deleting unlinked messages with phase 1.
3332 [2021-03-01 14:59:24.869] [background] [info] Sync loop complete.