this post was submitted on 11 Oct 2023
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Rust Programming
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I suppose it's because the article you're citing is from april 22nd, and that hashbrown has replaced old std hashmap in this commit, which hash been created on 24th.
I suppose (can't test myself) that if you do the test now (hashbrown against std), the performance difference would be negligeable beacuse you would be testing roughly the same algorithms.