Scheme HTTP server with transparent async – 222k req/s

In plain words

Hyper is an HTTP server written in Scheme that handles asynchronous requests transparently. It processes 222,000 requests per second, making it suitable for developers seeking high-performance web infrastructure built on functional programming principles. The server abstracts away async complexity, allowing users to write straightforward code without managing callbacks or promises explicitly. It targets Scheme enthusiasts and teams needing efficient request handling for web applications.

written from the facts on this page · September 2026

From the sources

I published a benchmark report comparing 15 HTTP server implementations across C, Rust, Java, Scheme, Go, Node.js, Deno, Bun, Gleam, Common Lisp, Python, Ruby, and Racket. Scheme (pico + io_uring) placed fifth overall at 222k req/s — behind C (h2o), Rust (axum), Java (Vert.x), and Bun, but ahead of Deno, Go, Node.js, and everything else. These are micro-benchmarks. I want to be honest about what they show and what they don’t. A trivial counter endpoint. Single-threaded. Ten seconds per concurrency level. wrk as the load generator. No disk, no database, no parsing, no serialization. The purest measure of “how fast can this runtime shuffle bytes through a socket.” req/s (thousands) vs…from hyper.dev

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