Core Web Vitals is a set of three metrics Google uses to describe what a real visitor experiences on a page. Google's own definition calls it "a set of metrics that measure real-world user experience for loading performance, interactivity, and visual stability of the page." A small-business owner does not need to become a performance engineer to read these numbers; the three thresholds below are published as-is, with the sources linked.
What are the three Core Web Vitals metrics?
The three metrics are Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS), and each one covers a different part of the experience: loading, responsiveness, and visual stability.
Largest Contentful Paint (LCP) measures loading. web.dev states: "To provide a good user experience, LCP should occur within 2.5 seconds of when the page first starts loading." It measures the time until the biggest visible element on the page (usually an image, a video, or a large block of text) has rendered.
Interaction to Next Paint (INP) measures responsiveness. web.dev states: "To provide a good user experience, pages should have a INP of 200 milliseconds or less." Search Console's help page describes INP as observing "the time that it takes for the page to respond to all click, tap, and keyboard interactions" during the visit.
Cumulative Layout Shift (CLS) measures visual stability. Google's Search Central documentation puts the "good" line at "less than 0.1." CLS adds up how much visible content jumps around unexpectedly while the page loads and while a visitor is using it — the classic case is a button that moves right as someone is about to tap it.
What does "75th percentile" mean here?
It means a page is judged by a point near its slower visits, not by its best load or its average load. web.dev recommends measuring "the 75th percentile of page loads, segmented across mobile and desktop devices," and a page passes only "if it meets the recommended targets at the 75th percentile for all three" metrics. In practice, that means picking the point where 75 out of 100 real visits were at or better than a given time or score, and checking that point against the threshold, not the fastest visit and not a lab test on a fast office connection. Search Console's help page describes the same idea per metric, for example: "Group LCP shown in the report is the time it takes for 75% of the visits to a URL in the group to reach the LCP state."
Where do I see my own numbers?
Open the Core Web Vitals report inside Google Search Console. Per Search Console's help page, the report "shows how your pages perform, based on real world usage data," grouping URLs by status (Poor, Need improvement, or Good) for each of the three metrics, separately for mobile and desktop. The same help page also points to running "a live performance test for individual URLs using the PageSpeed Insights testing tool."
How much does this affect ranking?
Core Web Vitals are one of many page experience signals, not a single deciding factor. Google's page experience documentation states plainly: "There is no single signal. Our core ranking systems look at a variety of signals that align with overall page experience." On Core Web Vitals directly, it says: "We recommend site owners achieve good Core Web Vitals for success with Search and to ensure a great user experience generally," while cautioning that "getting good results in reports like Search Console's Core Web Vitals report or third-party tools doesn't guarantee that your pages will rank at the top of Google Search results; there's more to great page experience than Core Web Vitals scores alone," and that "trying to get a perfect score just for SEO reasons may not be the best use of your time."
What a small site usually checks first
Start with the pages your Search Console report labels "Poor". The help page recommends "fixing everything labeled 'Poor' first". Within a status, Search Console's help page recommends prioritizing "either by issues that affect the most URLs, or by issues that affect your most important URLs" — for a small site, that usually points straight at the homepage and the top landing pages, since those are the ones most visitors and search traffic reach first.
Where this fits with CitedGEO
Our SEO service includes diagnosing Core Web Vitals issues as part of a technical review. Our free GEO audit does not measure Core Web Vitals. It runs 10 buyer questions through Perplexity and Google AI Overviews, three times each, and reports what the 60 answers name and cite for your category.