Explore the engineering behind OTP 27's new high-performance JSON module in this conference talk from Code BEAM Europe 2024. Discover how this module achieves performance that significantly exceeds existing pure-Erlang and Elixir libraries, sometimes even outperforming NIFs written in C, while offering a more flexible and adaptable API for new applications. Learn various tips and tricks for building performant Erlang and Elixir libraries, examine the technical approaches that enabled such impressive speed and flexibility, and explore the tools available to aid in developing high-performance BEAM applications. Gain insights into JSON handling optimization techniques and performance engineering strategies specifically tailored for the BEAM virtual machine ecosystem.