Bottleneck (bottleneck) is a concept of constraint in system design. English meaning “neck of a bottle.”… rate-determining (risuku)… bottleneck (airo), a synonym also exists… An allusion to the fact that no matter how large the size of the bottle, the volume and rate of outflow (throughput) of the contents is constrained only by the narrowed neck.
https://ja.m.wikipedia.org/wiki/ボトルネック
Local optimization of non-bottleneck areas does not improve overall throughput (local optimum is not global optimization).
relevance - Don’t guess, measure.
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