How runtime options affect child enclaves

The child enclave gets its runtime options from one of the sources discussed in z/OS Language Environment Programming Guide. The runtime options are completely independent of the creating enclave, and can be set on an enclave-by-enclave basis.

Some of the methods for setting runtime options might slow down your transaction. Follow these suggestions to improve performance:

If you need to specify options in CEEUOPT, specify only those options that are different from system defaults.
Before putting transactions into production, request a storage report (using the RPTSTG runtime option) to minimize the number of GETMAINs and FREEMAINs required by the transactions.
Ensure that VS COBOL II transactions are not link-edited with IGZETUN, which is no longer supported and which causes an informational message to be logged. Logging this message for every transaction inhibits system performance.