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Tableau 10.5's feature is Subscribe Users in Group - which means that a unique subscription is created for each user in the group, rather an a single subscription for the group itself. You'd see the same performance and email address requirements as individually subscribing each user, it's just easier to subscribe them
Tableau Server should be hitting the cache to send the same view to multiple people in a subscription - if you are seeing performance degradation from sending subscriptions, please open a case with Tableau Technical Support and they can analyze your logs to see if the cache is being utilized properly.
Thanks for the response Carisa!