The following article has two parts. The first part describes improving Allegro iOS app launch time by adopting static linking and sums it up with a speedup analysis. The second part describes how I managed to launch a custom macOS app using not-yet-fully-released dyld3 dynamic linker and also completes with an app launch speedup analysis.

This article tells a story of chasing an iOS bug – a bug hidden so deep that it required many different skills and debugging on different levels to identify it. I think every native mobile app developer (not only an iOS developer) will find this text interesting. Non-mobile developers may find it an intriguing read as well.

Two weeks ago, I attended Swift Warsaw as a speaker, holding a presentation on “Swift Runtime — Swift Method Dispatching”. I promised to summarise the talk in an article, so hereby I keep my promise.