In certain situations, performance issues may occur within CICS when issuing certain types of RACF requests when an HTTP request is sent to CICS for HostBridge to process. This issue was first noticed when an attempt was made to utilize the CWXN elimination enhancement provided in later versions of CICS TS.
If you are experiencing performance issues where none existed before, be sure that the following IBM APARs/PTFs have been applied:
OA50748 - Minimize KDFAES performance impacts in certain application flows (PTF UA83757)
OA50749 - SAF Macro Support for RACF APAR OA50748 (PTF UA83755)
OA50736 - Supersedes OA50749 (PTF UA92549)
Here are the APAR abstracts: