Well, I just wanted to give an update on the outcome of the TGR Pong multiplayer using Mirror Networking. The lan version worked great, the latency was 0 so there was no lag. For me this was very exciting, of course I was very concerned once I introduced internet latency into the mix, especially since everything was going through the relay server.
After some time, I finally completed the multiplayer version using my relay server. It was a disaster, the latency was too high and for a precise game like pong, this will never work. In order for me to make this playable, I would have to spend quite a bit of time studying client prediction at a minimum. Personally I am not in a position to invest the kind of time I need to get this working so I am stopping any future multiplayer development and focus on my Role Playing Game.
Of course I will definitely go back to multiplayer, since that is my number 1 passion in game development, but right now I need to focus on the Role Playing game and getting those systems completed.