Your p50 latency is 40 ms. The dashboard is green. And yet users are complaining that the app "feels...
Your p50 latency is 40 ms. The dashboard is green. And yet users are complaining that the app "feels slow" during peak hours. If you've been on call long enough, you know this scene - and you know the average is not telling you the truth.
Here's the mental model that fixes it.
Little's Law: the one equation you actually need
L=λ×W
L = \lambda \times W
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