Compilation extremely slow since macros adoption

[Kyle-Ye (Kyle)]

[Accepted] A New Direction for Testing in Swift

I'm afraid we don't yet have a good technical solution for the general problem of not needing to compile swift syntax from source in order to compile macros outside of the toolchain. It is well understood though that this is an important feature for the community and one where solutions are being actively investigated, but there aren't any updates to share as of right now. Starting a new thread on the forums won't accelerate this process.

@vatsal