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by turtles3 862 days ago
Just letting you know it's not you - this is a well known long standing issue with keycloak. Typically users see a significant performance cliff at around 300-400 realms. While one realm is not necessarily the same as one tenant in keycloak, it does make it a significantly larger headache to support multi tenant with SSO integrations in a single realm.

I'm afraid I can't give you more details than that, we just moved on from keycloak at that point.