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Numbers we can defend: budgets agreed before the first commit, what the field data says once real phones show up, and the gap between a good lab score and a page that feels quick. Mostly it is about shipping less.
2 posts
Lab tools measure a robot on fibre. Field data measures your readers on a bus. Here is the smallest honest setup we could build: three metrics, one endpoint, no third party script, and the week our two sets of numbers disagreed by two and a half seconds.
A budget is not a Lighthouse score and it is not a Slack message. Here is the one we now write into the contract: four numbers, the device they are measured on, and the sentence that decides what happens when someone asks for a video header in week nine.