You gave NO useful information to help us solve your performance problem. How much data? Hardware situation? Where is distributor? Network configuration/speed? How much stuff is being replicated? etc, etc.
As a general rule, I tell all of my clients to not attempt to use any additional functionality that they don't know enough about to monitor and tune. 🙂
Best,
Kevin G. Boles
SQL Server Consultant
SQL MVP 2007-2012
TheSQLGuru on googles mail service