CBOR is derived from MessagePack, and is used throughout BlueSky/AtProto. Reports there are that JSON is still the speed champ, by a healthy measure. I am amon

CBOR is derived from MessagePack, and is used throughout BlueSky/AtProto. Reports there are that JSON is still the speed champ, by a healthy measure. I am among many who seem to chalk this up to JSON encoding/decoding being fantastically well optimized, having many heavily-invested in very well tuned & optimized libraries available. (Ed: well, https://github.com/djkoloski/rust_serialization_benchmark https://github.com/djkoloski/rust_serialization_benchmark only shows rust options, but somewhat contradicting this. JSON encoding appears ~3x slower, when looking at best CBOR & JSON performances) This article feels quite broad & high level, as a general introduction. With a couple graphs thrown in at the end to try to close the deal. The space savings I tend to think are probably reasonably representative regardless of the library being tested. But the speed is going to vary greatly, and this is one of very few examples I've seen where CBOR comes out faster. The article does not provide any information that I can see about what the test is, what data or libraries are being tested. It is worth noting that CBOR has heightened interest very recently, as the recent Kubernetes 1.32 shipped an alpha feature to talk in CBOR. The very good library below has gotten some good attention. https://github.com/fxamacker/cbor https://github.com/fxamacker/cbor