You should look into WebPerf

Cumulative Layout Shift, The Layout Instability Metric

Punishing Loyalty

Self Restraint

How to Optimize Third-Party Services Performance

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

Trackers on Your Domain, Revenue Risk

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

Measuring Interactivity with TTI
Time To (consistently) Interactive

Netflix: how to increase video speed