What Are Core Web Vitals?
Why it matters
They are among the few page-side signals Google names outright, and they are worth checking on a site you are about to buy a placement on: a page that takes eight seconds to load and shifts under the reader's thumb will send you very few visitors.
Example
A publisher's article scores badly on layout shift because its ads load late and push the text down. Readers give up before they reach the paragraph holding your link.
Common misconception
That good scores lift rankings on their own. Google has described page experience as closer to a tiebreaker than a substitute for relevance: fast pages do not outrank better answers, but slow, unstable ones lose readers whatever search does.
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