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How to improve migration performance when migrating to an on-premise Exchange 2013 or Exchange 2016 server

1.) Open an Exchange Management Shell

2.) Run the following cmdlets:

New-ThrottlingPolicy MigPolicy


Set-ThrottlingPolicy MigPolicy -RCAMaxConcurrency Unlimited -EWSMaxConcurrency Unlimited -EWSMaxSubscriptions Unlimited -CPAMaxConcurrency Unlimited -EwsCutoffBalance Unlimited -EwsMaxBurst Unlimited -EwsRechargeRate Unlimited

 

Set-Mailbox MigAdmin -ThrottlingPolicy MigPolicy

Where 'MigAdmin' is the name of your migration admin account.

3.) Restart the Exchange Transport Service to activate the the new throttling policy settings.