"Merge swiftmodules" build step taking a while on incremental builds

The "merge swiftmodules" step is taking about 18 seconds on incremental builds. The project is about 800 swift files in the main target, along with some Cocoapods that are compiled to dynamic libraries. Does anyone know why it might be taking so long, and how I could reduce it? Thanks

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I will pay someone $200 if they can provide an easy-to-implement tip that would get this time below 3 seconds