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I was really hoping that Xcode 15 would include some incremental build performance improvements, but I'm not seeing any so far. SWIFT_USE_INTEGRATED_DRIVER=NO is still 2-3 times faster. ~20s to recompile a one-line change, which isn't great, but it's workable. With the integrated driver, it's about 1m for every build, not counting getting it onto the sim/device, etc.

Worse, AppIntents extraction is now more aggressive, and adds an extra 70s even if AppIntents is not linked. FB12215849