Core Web Vitals are Google’s real-world measures of page experience: how fast your main content loads, how quickly your page responds, and how stable it stays. Google says good scores align with what its core ranking systems seek to reward. Learn what they mean, why they matter, and how to improve them.
Focusing on core web vitals SEO is a proactive approach to enhancing your site’s search engine visibility.
What are Core Web Vitals?
Core Web Vitals are a set of metrics from Google that measure real-world page experience: loading with Largest Contentful Paint (LCP), responsiveness with Interaction to Next Paint (INP), and visual stability with Cumulative Layout Shift (CLS).
Why are Core Web Vitals important?
Core Web Vitals are important because they inform site owners if their pages provide an excellent user experience. When visitors find your site helpful and easy to use, they’ll likely trust your business, visit again, and purchase from you.
Core Web Vitals also support your SEO. Google says its core ranking systems look to reward content with a good page experience, but good scores don’t guarantee a top ranking, and great page experience involves more than these scores alone.
“We highly recommend site owners achieve good Core Web Vitals for success with Search…This, along with other page experience aspects, aligns with what our core ranking systems seek to reward.”
By optimizing your Core Web Vitals along with other page experience factors, you’re improving the experience Google’s systems look to reward.
What’s a good Core Web Vitals score?
Here’s a breakdown of the scores you’ll want to get:
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What are the main pillars of Core Web Vitals?
The main pillars of Core Web Vitals are:
The table below summarizes what each pillar measures and the acceptable score for each metric:
| Core Web Vitals | What it measures | Ideal score |
| Largest Contentful Paint (LCP) | A page’s loading performance | LCP must occur within the first 2.5 seconds of the page loading. |
| Interaction to Next Paint (INP) | Responsiveness | 200 milliseconds or less |
| Cumulative Layout Shift (CLS) | Visual stability | 0.1 or less |
Let’s go through each one:
Largest Contentful Paint (LCP)
The LCP metric measures how long it takes the largest image, text block, or video on screen to render, counted from when a visitor first navigates to your page.
What’s a good LCP score?
Google recommends an LCP of 2.5 seconds or less at the 75th percentile of page loads, so three out of four visits should hit that mark (web.dev). Here’s how Google rates your page’s LCP:
- Good: 2.5 seconds or less
- Needs improvement: over 2.5 up to 4.0 seconds
- Poor: over 4.0 seconds
Why is LCP important?
For site visitors to have a pleasant experience, your pages must load fast and immediately give them the information they need. A slow-loading page will drive site visitors to bounce off your site.
Most sites still struggle on mobile. In July 2025 data from the Web Almanac, only 48% of mobile websites passed all three Core Web Vitals. LCP was the hardest to pass: 62% of mobile sites had a good LCP, compared with 77% for INP and 81% for CLS. That means nearly 4 in 10 mobile sites make visitors wait too long for their main content.
As an example, imagine someone researching educational software for learning a new language. If your site is slow, they’re likely to leave your site and find another company that meets their needs faster.
Interaction to Next Paint (INP)
INP measures how quickly your page shows a visual response after clicks, taps, and key presses. It reports the slowest interaction during the visit, ignoring outliers. It replaced FID, which only measured the delay before the browser started handling the first interaction.
What’s a good INP score?
- Good: 200 milliseconds or less.
- Needs improvement: over 200 up to 500 milliseconds.
- Poor: over 500 milliseconds.
Why is INP important?
When a page is slow to respond, visitors may think their click didn’t register and click again.
Cumulative layout shift (CLS)
CLS measures how much visible content moves around unexpectedly. It reports the largest burst of unexpected shifts across the whole time someone is on the page, not just while it loads.
What’s a good CLS score?
Google recommends a CLS score of 0.1 or less at the 75th percentile of page loads (web.dev). Here are the ratings:
- Good: 0.1 or less
- Needs improvement: over 0.1 up to 0.25
- Poor: over 0.25
Why is CLS important?
CLS tracks how stable your page elements stay for the whole visit. When your page elements don’t move around a lot, it’s easier for site visitors to interact with your site.
That’s because a page with a good CLS enables users to click the page element they intend to click or select a tick box they want to click. Page elements don’t shift unexpectedly while visitors read and click.
CLS is critical for all websites, but especially sites that accept orders online, like a retail store that allows online ordering for in-store pickup.
How to improve Core Web Vitals
The first step to improving your Core Web Vitals is to find out how you’re faring. You can do this by doing either of the following:
- Checking the Core Web Vitals report in Google Search Console
- Entering your URL into Google PageSpeed Insights and clicking “Analyze”
Both tools tell you how your page performs. PageSpeed Insights also informs you how you can improve your page’s performance.
You can also implement these best practices for optimizing your Core Web Vitals:
Optimize your LCP to improve your page’s load speed
You can implement these LCP best practices:
- Optimize your images: Reduce your image’s file size by compressing them, so they load faster on your website.
- Reduce your file sizes: Optimize your page’s file size to load quickly on user’s browsers.
- Never lazy load your main (LCP) image. It delays the content visitors are waiting for, yet about 16% to 17% of pages still do it.
- Use a content delivery network (CDN). A CDN is a network of servers and data centers that caches content so that your content can reach your users faster.
Improve site responsiveness by optimizing INP
These changes can improve your INP score:
- Break up long-running JavaScript so the browser can respond between tasks.
- Cut unnecessary JavaScript, including third-party tools and scripts you don’t need.
- Avoid large rendering updates after a click or tap.
Optimize your CLS to improve your page’s visual stability
Implement these best practices to make your page visually stable:
- Set
widthandheight(or CSSaspect-ratio) on images so the browser reserves space. The Almanac found 62% of mobile pages leave at least one image without dimensions. - Load key fonts early.
- Animate with
transforminstead of properties that move layout.
Improve your site’s user experience by optimizing your Core Web Vitals
Business owners like you must regard your website as your online store and provide a delightful online customer experience. By optimizing your Core Web Vitals, you’re improving user experience and encouraging customers to revisit your site.
Adhering to core web vitals best practices ensures a smoother and more engaging experience for your visitors. Prioritizing Core Web Vitals demonstrates a commitment to a seamless user experience, which Google’s ranking systems look to reward.
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