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I too fixed performance problems in that repo a few years back and did a write up on it - https://jackson.dev/post/rust-coreutils-dd/
I'm glad this project is getting some more attention, maybe even getting funding from Ubuntu since they're using it? Last time I touched it most of the code was still pretty clearly written by Rust beginners and non-systems programmers so it likely had/has many such issues to uncover. Ubuntu putting it into their distro should hopefully get more experienced (and actually paid!) devs taking a closer look.