Exchange mailbox creation performance problem

In environment with 25000 users completion of mailbox creation process takes more than 2 hours.
In Job Queue Info I can see that 'adhoc projection' step is executing.

I turned on trace level logging and I can see that after mailbox is created, connector iterates over all users - I guess to find out ExchangeGuid of created mailbox
There are messages:
2019-06-10 12:29:37.5117 DEBUG (SystemConnector 2c6787d4-e51a-4269-b56d-65d20e684fc7) : The connector () does not support a QueryByExample! The query will be executed as a QueryByFilter without a native filter!
2019-06-10 12:29:37.5117 DEBUG (SystemConnector 2c6787d4-e51a-4269-b56d-65d20e684fc7) : Querying objects...
2019-06-10 12:29:37.5117 DEBUG (SystemConnector 2c6787d4-e51a-4269-b56d-65d20e684fc7) : ...ByFilter.


: Returned PSObjects: 1
Executing command:
Command: Get-Mailbox
-identity ...

Cleaning up item...
2019-06-10 12:53:36.9996 DEBUG (SystemConnection 2a5181c7-75b4-446b-9191-f8f6c87ac1d5) : QueryObjects result (out of scope): 1 system objects.
2019-06-10 12:53:36.9996 DEBUG (StopWatch SW) : Querying objects of prototype (test_user). done in 8037,48s.

Is it expected behaviour? Or it is possible to change the way how ExchangeGuid is retrieved?

We are using 8.0.2; Exchange connector is 2013.

Regards,
Ivan

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