I have started an IMAP migration for my email accounts, everything we going well, but lately (the last 2 or 3 hours) it is going too slow, like 2 messages every 5 minutes.

I have restarted the IMAP migration for only 1 account at a time, but it seems like that there is no positive effect on the velocity of the migration.

Please advise.

PD - i need the Migration tool for PST migration.

Thank you