[shakna]

It wouldn't be especially surprising to me.

JSON's parsing performance is difficult, whether or not the language doing the parsing is fast or not. There's a reason that there are almost always libraries claiming faster JSON performance, regardless of the language.

Go is marketed as a fast language, and they're still trying to build a high performance JSON parser [0].

Parsing JSON will always be slower than most of the alternatives.

[0] https://dave.cheney.net/high-performance-json.html