I think I'm seeing a similar bug where parts of clean builds will build serially, resulting in build times going from 20s to 60s (on an M1 Ultra). It's odd. Initial build, even if clean, will be super fast, 18 - 20s. If I clean, in Xcode or xcodebuild, the next build will be 60s. Been an issue since beta 1, still an issue in 14.1b3. FB10215613
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