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Re:Show HN: 3D multiplayer space shooter made with Three.js by echelon on Wednesday June 05, 2019 @09:40AM (#20104198)
Protobuf would be an excellent serialization. It's compact, binary, and efficient. There's a ton of library support in nearly every language imaginable.
Re:Show HN: 3D multiplayer space shooter made with Three.js by arendtio on Saturday June 08, 2019 @04:17AM (#20131271)
I am not 100% sure, but I think I read somewhere (at least 2 years ago), that browsers are actually faster using JSON than Protobuf (a bit counter-intuitive).

Nevertheless, bandwidth-wise it could make sense anyway, but I think it makes sense to consult some benchmarks in this case.