If you want to improve performance, you should start exploring the regions of the code that take the most time. In C, we have a ton of options: gprof, cachegrind, google-perftools, oprofile.
2.5 years ago, "oprofile" was the answer: https://mail.mozilla.org/pipermail/rust-dev/2012-April/001558.html
Is this still true?
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