Speed of light would just be rule, like cellular automata rules, Planck distance is cell size and the rule is you may only move one cell per frame in any direct

Speed of light would just be rule, like cellular automata rules, Planck distance is cell size and the rule is you may only move one cell per frame in any direction. Processing speed doesn't matter to us, it could take a million "years" to render a frame but we experience it in real-time. As you say pointer to shared memory location is basically hidden variable theory, you could also move faster than the speed of light by simply updating your location to any value, I have done this in game hacking before you just need a WriteProcessMemory api, might get caught by anti-cheats.