Is this auto-login behavior cookie based? If yes, do you check for the cookie for every new visitor session as seems required? If yes, does this put any overhead on server or slow down page loading in any way?
I am currently in a functional design phase for my application and haven't really started coding yet so I can't be any more specific. I am trying to understand the authentication workflow when a repeat user who has previously connected to the site with facebook, and is currently logged into facebook visits xenforo.
Thanks for any insights.