Cross-posting from the johnny-five gitter: Hey everyone, I just released v10.0.0 of Raspi IO!!! This release is a major rewrite of Raspi IO. It's now all written in TypeScript , has a more moduler and maintainable architecture, and greatly improves performance! CPU Usage had a regression somewhere in the old codebase, and would spike to 100% even with the LED hello world. CPU usage is now at 6-7% on an RPi 3 for LED hello world.