How to power-up Rails with Go, C or Rust, preserving the productivity of Rails (evilmartians.com)

Rails excels at business logic, developer happiness, and rapid iteration. Still, there comes a moment when performance bottlenecks emerge, and the typical refrain is: “rewrite in Go,” “extract to microservices,” or “break up the monolith.” But there’s a better way: scaling your Rails app by upgrading to heavy-duty tools, while keeping the recipes in Ruby.