watchOS app written in Swift 4?

Has anyone tried submtting a watchOS 4 app written in Swift 4?


My Watch app written in Swift 4 seems to contain 35 MBytes of libswift dylib's, which can take a very long time to load onto an Apple Watch. I measured the time it took to load and launch the Watch app an Apple Watch (pre-Series 1) from an iPhone 5s to be nearly 2 minutes. The armv7k Watch app executable is only 44 kBytes.


The review rejection notice I received was for 2.1 Performance: "the app does not progress past this loading screen when run on Apple Watch."


Could the large size of the required Swift frameworks be part of the problem with the slow loading?