Message content painfully slow to appear

I am running the 8.2.1478 version of eM Client
I have an IMAP account and a fast connection on a fast machine.
I have “download messages for offline use and to search in message bodies” checked in the IMAP account.
When receiving mail, the headers display immediately but the full emails can take minutes to load, even when only text/html.

I see related posts in the forum but was unable to find a ‘primary’ ticket in which this was being discussed/addressed. A great program otherwise, but this is a show-stopper…

EMC: 8.2.1478
OS X: 11.3 (20E232)