I have a similar experience. Also, for the longest time Rails was also incredibly slow at generating JSON, of all things. JBuilder [1] was a few orders of magni

I have a similar experience. Also, for the longest time Rails was also incredibly slow at generating JSON, of all things. JBuilder [1] was a few orders of magnitude slower than using .to_json directly or other libraries. [1] https://github.com/rails/jbuilder https://github.com/rails/jbuilder, maintained by DHH and the Rails team. AFAIR, the "official" JSON serialization DSL.