High-performance systems in Swift
summary
Claims that classes are faster than structs get dissected with concrete numbers and code: a naïve HTTPRequest struct copies cost ~52 ns versus an Int baseline much lower; moving all stored properties into a boxed heap object and using copy-on-write via isKnownUniquelyReferenced makes the struct passable in ~50 ns while preserving value semantics. Examples come from SwiftNIO work, show the boxed storage pattern, the small benchmark, and when to apply this optimization.
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