IIRC, the original DOOM netplay (and serial/modem) used deterministic lockstep. If you have a low enough latency and a solid guarantee against packet loss it wo

IIRC, the original DOOM netplay (and serial/modem) used deterministic lockstep. If you have a low enough latency and a solid guarantee against packet loss it works fine for FPS. Problem is, of course, that neither of those things are true outside of a LAN (and sometimes even within them).