This talk proves this point exactly: https://youtu.be/zBkNBP00wJE https://youtu.be/zBkNBP00wJE Watch from 27:00 where he talks about using const wherever poss

This talk proves this point exactly: https://youtu.be/zBkNBP00wJE https://youtu.be/zBkNBP00wJE Watch from 27:00 where he talks about using const wherever possible so the compiler can optimise. It reduces a full function call to work out a colour in 3D space from thousands of instructions to one. After watching this and a few others particularly dynamic dispatch in Swift, I find myself adding as many hints as I can and applying the most restrictions / scoping possible. Final, const, Private etc. https://developer.apple.com/swift/blog/?id=27 https://developer.apple.com/swift/blog/?id=27 Even though actually it can work this out in your module!