Although you can connect approximately 5900 users to a group, large groups can degrade performance. Every time RACF® does processing related to a group, RACF brings the group's profile into storage. Processing of the RESOWNER field in a data set profile can require that RACF read a group profile into storage. Because large groups have large group profiles, when RACF brings a profile for a large group into storage, or updates the profile, it has the same effects on performance discussed in Large profiles.