Comment by rafram

Swift isn't quite as fast, because reference counting is inherently slower at runtime than the allocations/deallocations generated by the Rust borrow checker.

On the other hand, Swift has (IMO) a much cleaner and less symbol-heavy syntax than Rust. Easier to read and write. Less of a culture of doing crazy metaprogramming/DSL definition with macros, and the builder DSL built into the language (which SwiftUI uses) is pretty nice and generates mostly understandable compile errors.

I actually like Apple's APIs, even the legacy ones. There's some weirdness, like how some file APIs want paths and some want URIs, but it's not that bad.