The Ruby parser is implemented in C, so it’s more like comparing C to Elixir. Obviously C is going to be faster 
We’re not doing that bad actually. It would be interesting to compare with Jason compiled with HiPE. In my benchmarks this makes it at least twice as fast.
The data is also quite different from what you’d face in a regular HTTP app - the JSON is pretty-printed, most JSON flying on the wire is not. This can have significant difference in the actual performance. Depending on what you want to learn from this, it can be important.
