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For resources related to business applications that have high activity, the refresh of the related class(es) has a direct impact on the application. For example, the refresh of the TIMS class that has all the transactions defined and with an activity of more than 5k transactions per second, has an impact on the IMS and therefore on the business.
You mentioned that the SETROPTS RACLIST REFRESH causes loss of throughput. Is this loss due to the administrator needing to wait for the command to finish execution, or is the command causing other aspects of the system to slow down?
Which classes are you experiencing this with, and roughly how many profiles are in these classes?
Do you have RACGLIST processing enabled?
Have you considered the use of Coupling Facility cache structures for your RACF datasets?