Help test Cargo's new index protocol

Cargo's new index protocol will be available starting in Rust 1.68, which will be released on 2023-03-09. This new "sparse" protocol should usually provide a significant performance improvement when accessing

We would like your help in testing this new feature and infrastructure.
If you use beta (1.68) or nightly-2023-01-21 or newer, set the environment variable CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse, or edit your .cargo/config.toml file to add:

protocol = "sparse"

We would like to hear reports on your experience. If you run into a problem, please open an issue. If you would like to post general feedback, feel free to leave a message here.

More information can be found in this blog post: Help test Cargo's new index protocol | Inside Rust Blog


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