Speed up Xcode Swift build times

Question

As my project has grown over the past year, so have its build times. Over the last few months it\'s gone from 4 minutes to around 7 (time includes GitHub pull, unit tests, etc).

Answer 1

Xcode 8.1/Swift 3.1 adds some relief for projects including some ObjC. Precompiled headers are back! https://swift.org/blog/bridging-pch/

If your project includes a bridging header, this will help. (In Xcode 8.1 beta 4 and later, this is the default; in prior betas add -enable-bridging-pch to Other Swift Flags).