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In most of these benchmarks [1] Swift's performance comes pretty close to that of Rust. So yeah, I would call that very fast.

[1] https://web.archive.org/web/20190402100249/https://benchmark...

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Try some JSON benchmarks with Codables in Swift vs serde in Rust. Rust smokes Swift, something like 20x.

Incidentally I've spent considerable effort on this problem, including writing a prototype faster JSON parser in Swift (still about 3x slower than Rust, but a huge speedup over what's there). I couldn't get anyone in the Swift community to care enough to motivate me to finish the work, which is indicative of a deeper problem: Swift just doesn't have "performance culture," the benchmark game results notwithstanding.

Hmm...when I look at those numbers, Swift only comes close in a very few, is significantly slower in most (50%-4x) and much slower in one (45x):

fannkuch / pidgins: essentially the same

binary-trees / fasta / Mandelbrot: ~ 1.5x slower

spectral-norm / reverse-complement: >= 2x slower

k-nucleotide / n-body: ~4x slower

regex-redux: 45x slower

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