An In-Depth Guide To Measuring Core Web Vitals
Smashing Magazine
APRIL 19, 2021
Total Blocking Time (TBT) is a good proxy for FID when using a testing tool without any direct user interaction, but also keep an eye on Time to Interactive (TTI) when looking at FID. Google uses anonymized data from Chrome users to feedback metrics and makes these available in the Chrome User Experience Report (CrUX).
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