I would first check if the size is within the accepted range.
Use this tool
https://www-secure.symantec.com/connect/articles/how-use-sepm-database-sizing-tool
Calculate the Size of your DB for 50 Revs.
do you find lot of difference?
You may need to schedule the DB Maintenance task on your SQL server
Maintaining the database
http://www.symantec.com/business/support/index?page=content&id=HOWTO55337