If you recall, I complained about Apple Mail fetching mail slowly.
Then Randy showed me/us how to rebuild the mail envelope, and that fixed the problem.
Upon installation of a new Sequoia update, mail started fetching mail slowly once again. This time, an envelope rebuild did not help.
I guessed that it was release-related and they'd fix it sooner or later.
I was right: Sequoia 15.5 fixed whatever problem they had!
Paul
Paul Blumstein