Would particularly like to know if anyone has done a performance comparison with the new API coming in the stdlib[2], which feels like a better bet. That blog says:

The Marshal performance of v2 is roughly at parity with v1. Sometimes it is slightly faster, but other times it is slightly slower. The Unmarshal performance of v2 is significantly faster than v1, with benchmarks demonstrating improvements of up to 10x.

[1] https://github.com/json-iterator/go/issues/706

[2] https://go.dev/blog/jsonv2-exp