Core Web Vitals
Core Web Vitals are the three measurements Google uses to describe how a page feels to use.
Also known as: web vitals · page experience metrics
They are LCP (how long until the main content appears), INP (how quickly the page answers an interaction) and CLS (how much the layout moves while loading).
They matter for two reasons. They are part of how Google ranks pages, and — more importantly — they are the closest numbers there are to what a visitor actually experiences. The measurement that counts is field data from real visitors, not a lab score on a fast connection.
Common questions
What are the target values?
LCP under 2.5 seconds, INP under 200 milliseconds, CLS under 0.1 — measured at the 75th percentile of real visits.
Can a 3D site pass these?
Yes, if the 3D scene is not what the metrics measure. The scene can load after the first paint; what LCP sees should be a real image or heading, not a canvas still starting up.
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