Here's the bulk of the code used to generate the code they're building: https://github.com/vercel/turbo/blob/main/crates/turbopack-c...

They're building basically the same thing over and over again. This surprised me, given their intro post: https://vercel.com/blog/turbopack

Relevant quote:

> Turbopack is built on Turbo: an open-source, incremental memoization framework for Rust. Turbo can cache the result of any function in the program. When the program is run again, functions won't re-run unless their inputs have changed. This granular architecture enables your program to skip large amounts of work, at the level of the function.

I'd be curious to see if a real-world app (or even one generated with more variety in components) showed comparable performance numbers