What are good Core Web Vitals scores?

A good Core Web Vitals result means a Largest Contentful Paint (LCP) of 2.5 seconds or less, an Interaction to Next Paint (INP) of 200 milliseconds or less, and a Cumulative Layout Shift (CLS) of 0.1 or less. Each is judged at the 75th percentile of page loads, and all three should be good.

Why it matters

These three numbers describe what visitors feel: how soon the main content appears, how quickly the page reacts, and whether it stays still. Search Console reports them per group of URLs, and a group only counts as good when every metric meets its threshold. Google has said page experience is one of many signals, so treat these numbers as a quality target for visitors rather than a ranking switch.

How to check

The thresholds

Metric	Good	Needs improvement	Poor
LCP (loading)	2.5 s or less	Over 2.5 s to 4 s	Over 4 s
INP (responsiveness)	200 ms or less	Over 200 ms to 500 ms	Over 500 ms
CLS (visual stability)	0.1 or less	Over 0.1 to 0.25	Over 0.25

First Input Delay (FID) is no longer part of the set. INP replaced it in March 2024.

What the 75th percentile means

Imagine every visit to a page sorted from best to worst experience for one metric. The 75th percentile is the value that three quarters of visits are at or better than. If your LCP at that point is 2.3 seconds, the page passes for LCP, even though some visitors on slow connections waited longer. This stops a few extreme cases from deciding the result, but it also means you cannot ignore the slower quarter of visits.

Steps

Open PageSpeed Insights and look at the field data block for your URL or origin.
Check the Core Web Vitals report in Search Console for groups of pages marked Poor or Needs improvement.
Repeat the test for mobile, since it is usually the harder target.
After a fix, wait for field data to update before judging the result; it is collected over a rolling period, so changes take time to appear.

Common mistakes

Chasing a perfect Lighthouse score instead of the thresholds above.
Looking at one metric and ignoring the other two.
Judging results from a single lab test on a fast office connection.
Expecting improved numbers to appear in field data the next day.

Frequently asked questions

Do I need a score of 100 in Lighthouse?

No. The Lighthouse performance score is a lab summary and not the Core Web Vitals assessment. The thresholds above, measured on real visits, are what the field report uses.

Why does my page pass on desktop but fail on mobile?

Phones have slower processors and often weaker networks, so the same page produces worse timings. Fix mobile first.

What if I have too little traffic for field data?

Low-traffic pages may show no field data. In that case use lab tools to look for problems and aim for the same thresholds.

Crawvix's scan checks whether real-visitor Core Web Vitals pass. To see a sample, Try the free website sample.