The RMF™ workload activity report shows increased response times, and a decrease in the number of ended transactions.
This situation could be caused by converting from ISC to MRO between the TOR and the AOR.
When two CICS® regions are connected via VTAM® intersystem communication (ISC) links, the perspective from a WLM viewpoint is that they behave differently from when they are connected via multiregion (MRO) option. One key difference is that, with ISC, both the TOR and the AOR are receiving a request from VTAM, so each believes it is starting and ending a given transaction. So for a given user request routed from the TOR via ISC to an AOR, there would be 2 completed transactions.
Let us assume they have response times of 1 second and .75 seconds respectively, giving for an average of .875 seconds. When the TOR routes via MRO, the TOR will describe a single completed transaction taking 1 second (in a begin-to-end phase), and the AOR will report it's .75 seconds as execution time. Therefore, converting from an ISC link to an MRO connection, for the same workload, could result in 1/2 the number of ended transactions and a corresponding increase in the response time reported by RMF.
Increase CICS transaction goals prior to your conversion to an MRO connection.