When you enable MSMQ, do not include MSMQ's Active Directory Component. This will greatly improve the performance of the Kaseya Server.
MSMQ AD: XP
MSMQ AD: 7 and 8
MSMQ AD: 2003 and 2003 R2
MSMQ AD: 2008 and 2008 R2
MSMQ AD: 2012 and 2012 R2