I've been continuing the work on my Ruby JSON serialization gem. While there are still a few more features that I'm considering, based on user needs, the benchmarks I've done are showing extremely promising results.
It's at least 2x faster than all other Ruby-based alternatives. Shout out to Panko Serializer for being _slightly_ faster in some cases with its C bindings.
If anyone wants to give it a whirl, head to https://github.com/spellbook-technology/transmutation.