APPC component trace, although beneficial for diagnostic information, degrades performance. To limit APPC tracing to abnormal events only, you can invoke component trace as follows:

   TRACE CT,ON,COMP=SYSAPPC

When prompted for a reply, respond with:

   REPLY id,END

Even this minimum amount of tracing can affect performance; to achieve maximum performance after APPC work is stable, turn APPC component trace off as follows:

   TRACE CT,OFF,COMP=SYSAPPC