I mean, that's just Amdahl's law, right? Your speedup is directly related to how much the thing you improved was the bottleneck. (Though of course that's just

I mean, that's just Amdahl's law, right? Your speedup is directly related to how much the thing you improved was the bottleneck. (Though of course that's just for raw speed; for cost and total compute needed, every cycle/IO counts.)