I was just recently testing this comparing two mail clients, one that used the server-side search and one that pulled everything to the client and searched there.
This was on a large complex account (80+ folders containing >60K messages)
searching on the client across all folders, 15 min
searching on the server, 4 seconds
there are a lot of BAD IMAP implementations out there, courier-imap is one of them. it talks the IMAP protocol to the client, but is very inefficient on the server.
Copyright © 2018, Eklektix, Inc.
Comments and public postings are copyrighted by their creators.
Linux is a registered trademark of Linus Torvalds