If you want to compare json with a couple things, flatbuffer’s benchmark includes those (the super fast rapidjson, which is a lot faster than anything in elixir) and so forth:
https://google.github.io/flatbuffers/flatbuffers_benchmarks.html
Flatbuffers, due to knowing the possible schema, is significantly faster than rapidjson in every single way in binary mode, and when encoding to/from flatbuffer’s json it is still significantly faster than rapidjson, just not as fast (still a lot faster than just 3x-4x speedup that msgpack supposedly gives), and flatbuffer’s binary format is significantly smaller message size too.
