alt Hacker Newstl;dr: Rust officially allows you to write inline assembly so it's fast, but in C it's not officially specified as part of the language. Plus more points which do not actually indicate Rust is faster than C.
... well, that's what I get for reading an article with a silly title.
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The article felt fairly dispassionate and even-handed to me, and I say this as someone who dislikes Klabnik very much and also dislikes the Rust community (especially its insidious, forced MIT rewrites of popular GPL software, with which they also break backwards compatibility). It is worth mentioning that there are certain things about Rust that conceivably could make it faster, e.g., const by default (theoretically facilitating certain optimizations), but in practice, thus far, do not.
That’s not how I would summarize what I wrote, for what it’s worth. My summary would be “the question is malformed, you need to first state what the boundaries are for comparison before you can make any conclusions.” I think this is an interesting thing to discuss because many people assume that the answer to “is x faster than C?” to be “no” for all values of X.