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In this article I'll discuss different strategies for incrementally adding Rust into a server written in another language, such as JavaScript, Python, Java, Go, PHP, Ruby, etc. The main reason why you'd want to do this is because you've profiled your server, identified a hot function which is not meeting your performance requirements because it's bottlenecked by the CPU, and the usual techniques of memoizing the function or improving its algorithm wouldn't be feasible or effective in this situation for whatever reason. You have come to the conclusion that it would be worth investigating swapping out the function implementation for something written in a more CPU-efficient language, like Rust. Great, then this is definitely the article for you.

The strategies are ordered in tiers, where "tier" is short for "tier of Rust adoption." The first tier would be not using Rust at all. The last tier would be rewriting the entire server in Rust.

The example server which we'll be applying and benchmarking the strategies on will be implemented in JS, running on the Node.js runtime. The strategies can be generalized to any other language or runtime though.

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