You are the administrator for a mid-sized company that uses Windows 2003 and Windows Server 2008 domain controllers. Your plan is eventually upgrade all domain controllers to Windows Server 2012. The five sites you have are not fully routed and therefore there have been some problems with regard to replicating Active Directory data. You know your budget will not allow you to add additional links or purchase additional equipment. What can you do to improve the efficiency of replications within in your network?