This helped me a lot, thanks for sharing! It is also explained a bit here in this article: https://bitrise.io/blog/post/demystifying-explicitly-built-modules-for-xcode This feature has a good idea behind it, but in the end made the build times for my project super slow (it contains a large mixed swift/objective-c codebase). Note that this is enabled by default in Xcode 16. I disabled it using fastlane, you can also use a custom .xcconfig for this, but there is option in Xcode directly.