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Spit balling: If it is just for a player, you could just do the calculation on the client. Then send a network packet to the server when your "out of breath" happens so it can do whatever processing you need it to do. This will be more efficient and won't swamp the network with your position packets. The only additional network traffic is your out of breath packet. There is nothing wrong with doing stuff on the client if it is more optimal. But any state changes that need saving or sending to other players need to be done on the server. Of course this assumes you trust the client. Somebody could hack a client that removes your processing. 🙂