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Discussion on: Optimizing Speed and Usability for Google's Core Web Vitals in 2021

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Ingo Steinke •

There have been some updates to Web Vitals, according to Vitals updates, and Interaction to Next Paint:

  • Interaction to Next Paint (INP) as a possible replacement for First Input Delay (FID),
  • deprecation of Time to Interactive (TTI) in 2023
  • increase in weight for Cumulative Layout Shift (CLS): 15 -> 25

Expected outcome of the weight changes according to Google's assumptions based on an HTTP archive study (quoted from Speedcurve's blog post):

We expect this to improve most pages' performance scores, since most pages tend to score better on CLS than TTI.

Interaction to Next Paint (INP)

Quoting web.dev, Interaction to Next Paint (INP) has been introduced in 2022 as

an experimental metric that uses data from the Event Timing API API. It assesses responsiveness. When an interaction causes a page to become unresponsive, that is a poor user experience. INP observes the latency of all interactions a user has made with the page, and reports a single value which all (or nearly all) interactions were below.