RTC key points and best practices to optimize performances
2 answers
The deployment Wiki talks about these and other items. Start here: https://jazz.net/wiki/bin/view/Deployment/PerformanceWhereToStart it is not Z specific though, I think.
This article is specific to z/OS: https://jazz.net/library/article/817
It is a bit old, but there is still a wealth of relevant information there.