[JkWhoSaysNi]

but transferring data across a network is significantly slower than calculating it on the server.

You're also doubling the necessary network traffic, which will double the lag. Any small gain in the amount of time taken to do the calculation will be lost by transferring the data across the internet twice.

Unless you're talking about making a direct connection between player A and player B and make graal a p2p network, the problem with that is that graal will have to listen on a specific port... which not everyone will have open for incoming connections.

Then what happens if player B logs off in the middle of the transaction? You get even more lag because the connection has to be remade with a 3rd player.

You're also relying on the potentially limted network and CPU speed of individual players.