When building HTTP APIs with Spin, performance matters — not just in raw response time, but also in startup latency and memory footprint, especially for WebAssembly modules running in constrained environments. In this post, we will break down the performance characteristics of three approaches to routing in Spin applications written in JavaScript or TypeScript: Using the Hono Router Using the Itty Router Using no router at all, and writing direct logic in Spin’s handler Why routing performance matters in Spin Spin apps are built for speed, fast startup, tiny binaries, and low-latency execution. However, when every millisecond counts, even your choice of router can become a bottleneck. Adding unnecessary abstraction could impact the overall application performance. That’s why it’s critical to understand the trade-offs between routing libraries and raw routing logic.…