Replication Server 15.5 includes several performance enhancements.
Replication Server – Advanced Services Option
Replication Server – Advanced Services Option is a separately licensed product option for Replication Server that contains Replication Server performance enhancements.
Dynamic SQL Enhancements
Replication Server 15.5 introduces several enhancements to dynamic SQL.
Function-String Efficiency Improvements
Replication Server 15.5 includes enhancements to function-string processing commands, stored procedures, and a system table to allow you to identify specific function strings that do not need to be applied to replicate databases.