Core Web Vitals monitoring

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In 2021, in addition to content and speed of a website, Google began to check and evaluate the quality of interaction (UX). Core Web Vitals have been developed specifically for this purpose - LCP, FID, TBT, CLS, among others. Read more about Core Web Vitals on our blog.

Monitoring Core Web Vitals allows you to detect a sudden deterioration in interface quality and react before Google decides to downgrade your site for it.

Core Web Vitals charts

How it works

Once a day, at a time of your choosing, we will:
  • measure ad hoc LCP, TBT and CLS values for the URL you specify (Lab data)
  • Retrieve from Google a 28-day moving average of LCP, FID, and CLS values for the URL or entire site (Field data).
If any of the measured or retrieved values exceeds the limits set by Google - we will report the failure and alert you.

Important Notice. Lab data is measured by us, from our servers. Field data, provided by Google, is measured using the Chrome browser during actual user visits. Field data is not available for websites with low popularity. It is also not available for all URLs within a website.


Decide at what time you want the metrics measured or downloaded. Next, select the type of device (desktop or mobile) and the level of the measurement - whether it should concern a single URL or the entire website collectively (origin).
The next step is to choose whether you are interested in Lab or Field data, or maybe both.
The last aspect is the threshold for recording failures and sending alerts - whether to alert you only when one of the indicators is in the "poor" area or maybe already at the "needs improvement".

Core Web Vitals configuration

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