Ruby is not the fastest language in the world, there is no doubt about it. This doesn’t turn out to matter all that much – Ruby and its ecosystem has so much more to offer, making it a worthwhile tradeoff a lot of the times. However, you might occasionally encounter workloads that are simply not suitable for Ruby. This is especially true for frameworks like Rails, where the overhead wants to be as little as possible. In this talk, we will explore building a native Ruby extension with Rust to speed up parts of Rails. What does Rust have to offer here over plain-old C? Let’s find out!