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. These tools run page loads on simulated networks and devices and then tell you what the metrics were for that test run.
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