Moving mail messages takes a very long time /hangs

Sometimes when moving mail messages to a local folder things don’t advance beyond the “This Operation may take a while to complete.” message.  If I kill the MailClient process and restart it, it will work ok again for a while.

Hello Scott,
are you perhaps moving large amount of messages or messages with large attachements?
What version of eM Client are you running? Check the full number in Help>About section.