Three Google metrics for real-user experience on a page: Largest Contentful Paint (loading, good at 2.5 seconds or less), Interaction to Next Paint (responsiveness, good below 200 milliseconds) and Cumulative Layout Shift (visual stability, good below 0.1). They are judged at the 75th percentile of page visits.
Example
Meera's home page on mobile shows an LCP of 4.8 seconds because of a 3 MB banner photo. After compressing it, LCP drops to 2.1 seconds, inside the good range.
How you'll hear it
“Our LCP is fine but INP fails on the product page; the size selector script is blocking the main thread.”
What it helps you decide
Whether to spend developer time on speed and stability, and which page templates to fix first.
Where people misread it
People expect good scores to lift rankings. Google says its systems reward good page experience, but that good Core Web Vitals do not guarantee top rankings, relevance still comes first, and chasing a perfect score just for SEO may not be the best use of time.
The story
The banner that slowed everything
Meera's Search Console Core Web Vitals report flags her mobile pages as 'Poor'. Her developer checks the home page and product page template.
| LCP before | 4.8 s |
| LCP after compressing the banner | 2.1 s |
| INP on product page | 180 ms |
| CLS before reserving image space | 0.24 |
| CLS after | 0.05 |
The fix took one day: a 3 MB banner became a 300 KB file, and images got fixed width and height so the page stopped jumping as it loaded.
What the scores do not promise is a ranking jump. Google says relevance comes first and good scores do not guarantee the top spot. The real gain is for shoppers on slow mobile connections, who now see the kurtas sooner and do not tap the wrong button when the page shifts.
So she watches what visitors do after the fix, not only her position.
Figures are illustrative. Field data in Search Console takes about 28 days to reflect changes.
Check your Core Web Vitals against Google's thresholds
The example's numbers are filled in. Replace them with yours.
All three metrics are in Google's good range. More speed work is a user-experience choice, not an SEO must.
Don't confuse it with
- Page speed: a general idea, often a lab score from a testing tool. Core Web Vitals are three named metrics, ideally measured from real visitors.
- Lighthouse score: a lab test result out of 100, not the field data Search Console reports.
Related terms
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Sources
- Understanding Core Web Vitals and Google search results, Google Search Central
- Web Vitals, web.dev (Google)
- Understanding page experience in Google Search results, Google Search Central