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Hi there, I found my simple ray tracer using concurrency on 8 cores of an A12 processor in my iPad quite slow compared to the same code running on Windows on only 2 cores. The latter was a release build and took a second the former 16 seconds. Using debug build on Windows yields 36 seconds. I tried a hack in Package.swift and injected an unsafeFlag -O with .when(configuration: .debug) but it crashed compilation whereas other flags (e.g. -Onone) don't. I thus assume a bug in SP4 or compilation for production was intentionally not foreseen. Can someone tell me if I'm right - or even better - how to get SP4 compile for production? Regards, Jürgen.