The IN25XPCF is used by CA Intertest for CICS to determine if a program should be monitored by CA Intertest for CICS. It associated with program INXXHOOK where XX is the CICS level. The IN25XPCF exit is how CA Intertest for CICS hooks a program for monitoring. It is normal for this program to do some TCB switching and there is no way - parameter to prevent the TCB switching. We have no reported performance problems in release 9.1 that points to CA Intertest CICS or the IN25XPCF exit as the cause.
Below is a display of the IN25XPCF exit running in CICS 5.2
XPCFTCH IN69HOOK IN25XPCF 800C3128 STARTED