I'm guessing you're using SwiftUI? When you do that, it bundles the entire Swift UI library, including all the parts you're not using, in your package - I think that's because they support runtime-defined UIs which means your app might use currently-unused Swift UI components in future...

I assume you've also seen this article? https://developer.apple.com/documentation/xcode/reducing_you...

No SwiftUI, backwards compatible to iOS 9.0, check the source if interested https://github.com/mro/ShaarliOS

Thanks for the link, I doubt it applies.