Painfully Obvious.

A stream‐of‐consciousness browsing session brought me to this writeup on how the Source engine deals with lag. Also serves as a parable for web developers — don’t rely on the client to validate input, for the same reason that a game server can’t trust a participant to tell it if that bullet hit anything. See also Ninjam, a clever latency workaround for online jam sessions. And consider that even without the inherent delays of Internet traffic, the speed of light would be a constraint on distant collaboration.