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I assume you're referring to normal_startup and startup_nosite in perf.py at h.p.o/benchmarks? Handy to know about (I need to explore our top-level repos more often, obviously), but probably still not going to measure time in the Windows PE loader as accurately as it'd need to be to conclusively prove a speed advantage. I'd probably need to hit up the Windows team for some of their profiling tools to get good numbers here.
Still, it's indisputable that this change will reduce the initial memory overhead, so I'll take Tim's 0.75 and run with it :)