The Swift compiler is notoriously slow due to how types are inferred1. Every June I hope that Apple will announce that they fixed it; sadly this is not that year.Here’s an explanation by the creator of Swift, Chris Lattner (From his Mojo talk):My experience with Swift is we tried to make a really fancy bi-directional Hindley-Milner type checker and it’s really great because you can have very beautiful minimal syntax but the problem is that A) compile times are really bad (particularly if you hav...