I would not say that that's a well-defined problem. What does "run smoothly" mean? Do you mean frame rate? Do you mean lack of discontinuous motion of object

I would not say that that's a well-defined problem. What does "run smoothly" mean? Do you mean frame rate? Do you mean lack of discontinuous motion of objects in the game? What does "unreliable connection" mean? How unreliable do you want to allow the connection to be and still have acceptable behavior? Are we talking about surviving continuous packet loss or about short-ish, bounded periods of no connection?