Use the PERFM keyword to specify a performance problem.
Document any user modifications to the program. Exits can affect performance. Consider whether user-installed code is contributing to the problem.
If the problem-type is performance, document the actual performance, the expected performance, and the source of information about the expected performance. If a document is the source, record the topic name and the date of the topic.
See Collecting documentation about all problems to complete your documentation of the problem.