Run a free Core Web Vitals check on any page and get your mobile score from Google’s own test. Add your email to see the full breakdown of what is slowing that page down for visitors.
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Scores come from Google PageSpeed Insights
We send your page through Google PageSpeed Insights on a simulated phone and report the numbers that come back. Here is what each one means for the person holding that phone.
Google’s Lighthouse test grades the page from 0 to 100 on a mid-range phone with a slower mobile connection. Because it blends several timings into one number, it is the fastest way to spot a problem.
This is how long the largest element on screen takes to appear, often the hero image or main headline. It marks the moment visitors feel the page has loaded, so Google counts 2.5 seconds or less as good.
This measures how much the page jumps while it loads, and a score of 0.1 or less is good. A button that moves just as someone taps it sends them somewhere they never meant to go.
This measures how fast the page reacts when someone taps, clicks or types. Google counts 200 milliseconds or less as good. Google can only measure it from real visitors, so it appears once your site has enough traffic.
When Google has no real-visitor data, we show this lab measurement in its place. It records how long scripts lock up the page, which stops the page from responding when someone taps a button.
Google sorts every measurement into three bands, and we use the same cut-offs for each one. Your result therefore lines up with what you would see if you ran PageSpeed Insights yourself.
| Measurement | Good | Needs improvement | Poor |
|---|---|---|---|
| Performance score | 90 to 100 | 50 to 89 | 0 to 49 |
| Largest Contentful Paint | 2.5s or less | Up to 4s | Over 4s |
| Cumulative Layout Shift | 0.1 or less | Up to 0.25 | Over 0.25 |
| Interaction to Next Paint | 200ms or less | Up to 500ms | Over 500ms |
| Total Blocking Time (lab) | 200ms or less | Up to 600ms | Over 600ms |
A note saying the result comes from a simulated test means Google lacked enough real-visitor data for this page. That is normal for most small business websites, and the lab numbers still point to the right problems. Because they come from a single test run, expect each number to shift a little every time you check.
Don’t judge the page on its score alone, because the individual measurements tell you where the problem sits. Look at Largest Contentful Paint first, since a slow first view loses people before they read a word.
When you press the button, we send the page address to Google’s PageSpeed Insights service with a mobile setting. Google then loads the page on a simulated mid-range phone and measures how long each step takes.
Google also records page timings from real Chrome users in a public dataset, the Chrome User Experience Report. When a page has enough of those visits over the last 28 days, we show the real-visitor numbers first.
We test the single address you enter, not your whole website, so the result describes one page. Home pages and product pages can score far apart, so test the pages that bring in leads or sales.
A common cause of a slow first view is one oversized image sitting at the top of the page. Resize the image to the width it displays at, then save it as WebP or AVIF, two modern formats. On WordPress, an image compression plugin can do this for every file you upload. Shopify and Wix convert images for you, but check that each original file isn’t far bigger than needed.
Chat widgets, pop-ups, tracking tags and sliders all add code that the phone must run before the page responds. Remove the ones you no longer use, and set the rest to load after the main content appears. That is the most reliable way to bring down Interaction to Next Paint and Total Blocking Time.
When text shows up late or changes style as the page loads, your fonts are holding the page up. Use one or two font files hosted with your website rather than pulled from another service. Then set font-display to swap, which shows text in a backup font until your own font arrives.
Layout shift often comes from images and ads without a set size, or from a cookie banner pushing content down. Give every image a width and height, and reserve space on the page for anything that loads late.
If every page feels slow, including the simple ones, look at your hosting before anything else on the site. Caching and a content delivery network such as Cloudflare both help, yet cheap shared hosting is often the root cause.
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