Swift spends 76% of the time incrementing/decrementing reference counts; ARC is ... | Hacker News

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		emmericp on Sept 12, 2019 \| parent \| context \| favorite \| on: A high-speed network driver written in C, Rust, Go... Swift spends 76% of the time incrementing/decrementing reference counts; ARC is just very bad at pushing tens of millions of objects through it every second. There's some more evlauation for Swift here: https://github.com/ixy-languages/ixy.swift/tree/master/perfo... It's just a coincidence that JavaScript and Swift end up with almost the same performance; there is nothing similar between these two runtimes and implementations.

skohan on Sept 12, 2019 [–]

This is also a clear optimization target. It is very possible to write Swift code which requires very little reference-counting overhead.

dep_b on Sept 12, 2019 | [–]

The problem is that 99% of all Swift developers use the language to create front-ends for powerful devices and you never need to squeeze the last drop of performance out of them.

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