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I've also used MessagePack on .NET, but as a serialisation format for use with a message queue - I don't recall the numbers off hand, but it's something like an order of magnitude to serialise and deserialise than JSON, and resulted in a lot less allocations too.

It supports compression too. Even if the resulting serialised size isn't always smaller than compressed JSON, from a performance standpoint it's a lot better.

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It might be better than text formats, but it still encodes most things as variable-size and this is not particularly machine-friendly. A format with separate metadata and fixed length encodings for most of the things (eg numbers) would be much more efficient to serialize / deserialize.

> resulted in a lot less allocations too

Especially if you use the MessagePack-CSharp library. That dude knows his high-perf .Net.

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