Thank you!

We developed this for our platform and CLI (which are Rust based) which is a bit of a different use-case than a one-off manual run of a linter (in which the difference perhaps wouldn't be as dramatic), although performant tooling for the end user should still be something we strive for IMO.

The "fast JS runtime" was Bun in this case, which we tried specifically because it has faster startup (and we also use in our CLI as a runtime for user defined functions). Most people would be using Node which is much more popular and likely have an even slower startup time.