I'm puzzled by the title of this post. From what I can gather most, if not all, of the performance improvements came from sacking SQLite and Zod.

They applied optimizations that cut CPU time by ~40% to the Bun version before comparing it with Node. Claiming 5x throughput from "replacing Node.js with Bun" is a wild misrepresentation of the findings.

Don’t let facts get in the way of a catchy headline

And they include "phase 3 opts" in the phase2 benchmark, so the move to Bun also includes improvements from removing "safeParse". So Node might've been at more than 40% of the performance.

It's sad since these kinds of numbers are interesting, but when there's blatant misrepresentations it just create a stink.