Check other comments. And while switching folders, which is the major part of UX anyway, is fast, because TB only scans a handful of messages in the view[0], w

Check other comments. And while switching folders, which is the major part of UX anyway, is fast, because TB only scans a handful of messages in the view[0], what about other operations which would need to scan the entire mailbox, like searching for something? [0] why even it does that? beats me, but clearly it does, otherwise you wouldn't see the speed improvement