And here come the Rust fan boys telling us the correct way to write the code so it will be faster than anything ever written, much safer than anything ever written and better than any programming language ever written.
Refer to my other comment here and the cited articles for a fair rebuttal: Rust lets you get equivalent or better performance (than Common Lisp or Java, in this instance) without significant special effort or deep knowledge of the environment, while being much more predictable; and if you do apply deeper knowledge of the language, then it’ll pull well ahead.
If there's easy out the box ways to write things that a normal Dev would do without pushing the language to its limits then it seems a bit unfair to ignore it. If I declared python to be the world's most performant concurrent language by hand wiring Cython and the deepest depths of the language and then completely ignored the out the box constructs in other languages that would be a bit misleading too.
As a Rust fanboy, Rust's advantage is that I wouldn't be afraid of dropping to its level, while I definitely wouldn't feel comfortable with C++ or C. Once the program is written, it's the usual cycle of optimizations: benchmark, flamegraph, cachegrind, etc.