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Set codegen-units to 1 in src/rust/Cargo.toml to eke out every last drop of performance

Rust 1.24 now sets codegen-units to 16 by default to speed up compilation time but it makes the final binary slower https://blog.rust-lang.org/2018/02/15/Rust-1.24

For maximum speed, setting codegen-units to 1 in your Cargo.toml is needed to eke out every last drop of performance.

So src/rust/Cargo.toml should be changed with that to squeeze the most perf.

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