I don’t know how the Swift program was compiled, but on my computer I get 2.64 (w/ normalization of my actual results to take CPU diff into account)…
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This article is from 2021 - before they started the Foundation rewrite.
If you are using an up-to-date Swift compiler, it has at least some of that rewrite code. Also, your computer may be faster than his?
I took the CPU difference into account by comparing w/ the rest of the bench that I ran locally.
The 2021 is probably the answer!