At the moment, these are provided as individual libraries because they are built as separate libraries on the command line. It's possible to build a static version of the core library with swiftc -static-stdlib on Darwin (there are still work in progress items for Linux and Foundation).
However, note that the majority of the libraries that you list are also used in a pure objective-c codebase; for example, running otool -L on Mail.app gives:
(Dispatch is embedded in libSystem on Darwin)
So the libraries you load are the same ones (in effect) to the ones used by your Objective-C application, in all likelihood. The difference is probably in the way that the libraries are set up and the dispatch once code is executed - which are necessary steps in bringing the Swift runtime up for your application.
On 17 Feb 2017, at 21:58, Michel Loenngren via swift-dev <firstname.lastname@example.org> wrote:
When starting an app that includes swift these libs are being loaded:
which adds considerable delay to our app startup time (compared to running a pure objective-c codebase). Is anybody aware of a way to reduce startup by combining these libs into a single lib for faster load time?