It's very different due to how the languages work. In React, you're creating JS objects. Naively, each of those is a heap allocation and a bunch of initialisati

It's very different due to how the languages work. In React, you're creating JS objects. Naively, each of those is a heap allocation and a bunch of initialisation. With Swift on the other hand, you're creating Views which are structs, which are value types, allocated on the stack, don't have much if any initialisation to do, and are much cheaper to work with. I say naively, because JS interpreters are probably doing smart things to try to minimise the impact of this sort of allocation of many small objects, but they still come at a cost that just isn't present in Swift.