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The 3-Second Rule of Web Performance — And How to Beat It

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signal score

⏳ Too early

trajectory — needs a few more hourly snapshots

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Signal history

7-day window (free)
Not enough history yet — the trend line fills in as snapshots accrue (hourly).

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second ruleperformancebeatjavascript
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Drop this in a README or blog post — it updates automatically as the score moves.