On my server (dovecot 1.1) the ARRIVE sorting is 80% faster,
but for folder with 7k messages it's only 0.01 sec.
It should be trivial to add a user-configurable option in roundcube toallow sorting by arrival date. Id be more than happy to make a patch.Would this be something of use to RC?
Not so trivial, for database caching you must add column for internal date
(and handle it). Or maybe use message ID would be sufficient?
Other thing is a lack of internal date column on messages list, so
changing sorting order could be confusing. But.... it's possible, so if you
like, create a patch, we'll see.