Incremental Rust builds are almost never minutes (on recentish hardware)

A quick measurement on my web browser project with almost 600 dependencies:

- A clean "cargo check" was 31s

- An incremental "cargo check" with a meaningful change was 1.5s

Building is a little slower:

- A clean "cargo build" was 56.01s

- An incremental "cargo build" was 4s

But I find that LLMs are mostly calling "check" on Rust code.

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That's on an Apple M1 Pro. The latest M4/M5 machines as ~twice as fast.