I don't think that's how whole module optimization works. From what I understand it slightly slows down compilation, but you end up with more performant apps. F

I don't think that's how whole module optimization works. From what I understand it slightly slows down compilation, but you end up with more performant apps. For this reason I think it's only used for Release builds (that's how I have it setup). https://swift.org/blog/whole-module-optimizations/ https://swift.org/blog/whole-module-optimizations/