You should look into WebPerf

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Cumulative Layout Shift, The Layout Instability Metric

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Punishing Loyalty

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Self Restraint

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How to Optimize Third-Party Services Performance

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Preload, Prefetch and Preconnect: Speed Up your Website with Resource Hints

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Trackers on Your Domain, Revenue Risk

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Performance timing: wait for the next frame
when using the User Timing API

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Measuring Interactivity with TTI
Time To (consistently) Interactive

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Netflix: how to increase video speed

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