[airspeedswift]

> The big performance hit in Swift would come in method dispatch where it’s following Objective C strategies which would result in indirect calls for object methods.

While Swift can use Objective-C's message sending to communicate with Objective-C libraries, that isn't its primary dispatch mechanism. In the case of the service described in the article, it isn't even available (since it runs on Linux, which does not have an Objective-C runtime implementation).

Instead, like Rust, Swift's primary dispatch is static by default (either directly on types, or via reified generics), with dynamic dispatch possible via any (which is similar to Rust's dyn). Swift also has vtable-based dispatch when using subclassing, but again this is opt-in like any/dyn is.