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. This is applicable to pages that receive little to no traffic, so small sites without field data don’t need to be worried. CrUX is Chrome only.
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