[cyann]

I've found the sparse protocol many times faster than git since Rust 1.68

To use the sparse protocol with crates.io, set the environment variable CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse, or edit your .cargo/config.toml file to add:

  [registries.crates-io]
  protocol = "sparse"

https://blog.rust-lang.org/2023/03/09/Rust-1.68.0.html#cargo...