How fast is your website? A plain guide to Core Web Vitals for business owners
Whether you run a hotel, a shop or a service business, your website is often a customer's first contact with you. If the page is slow to appear, slow to respond, or jumps around while it loads, people get tired before they ever see your offer.
Google measures that experience with three metrics called Core Web Vitals, and Google says they line up with what its core search ranking systems aim to reward. The good news is that you don't need to be technical to understand them.
The three numbers to know
Metric | What it measures | Google's "good" target |
|---|---|---|
LCP (Largest Contentful Paint) | How long the biggest part of the page, usually the main image or headline, takes to appear | 2.5 seconds or less |
INP (Interaction to Next Paint) | How quickly the page responds when someone taps or clicks | 200 milliseconds or less |
CLS (Cumulative Layout Shift) | How much content jumps around while the page loads | 0.1 or less |
Google suggests checking these at the 75th percentile of page loads, separately for mobile and desktop. In other words, your site should feel good for most of your customers, not just for you on the office Wi-Fi.
How to check your own site
PageSpeed Insights: enter a page address to see real-user data (when available) and suggestions for improvement.
The Core Web Vitals report in Search Console: if your site is set up in Search Console, it shows which groups of pages are slow or unstable.
Your own test: open the site on an ordinary phone over mobile data, not on the office computer.
Six practical ways to improve the numbers
1. Make the main image light and give it priority. According to web.dev, the largest element is an image on 73% of mobile pages. Compress the top image, use a lighter format such as WebP, and ask your developer or theme to load that image at high priority.
2. Don't lazy-load the top image. Lazy loading is great for images further down the page, but Google recommends removing it from the main image at the top, because it delays when that image shows up.
3. Give images and embeds a size. web.dev reports that 66% of pages have at least one image without a set size. An unsized image pushes the content below it down as it loads. Setting a width and height, or an aspect ratio, is one of the easiest ways to improve CLS.
4. Prune extra tools and plugins. Every tracking code, widget or plugin you added once and no longer use is extra weight. Google suggests regularly removing old, unused tags from your tag manager, which helps the page respond faster (INP).
5. Stop sliding banners from pushing content around. Cookie banners and notices that slide in from the top or bottom and shove content aside are a common cause of layout shift. Lay them over the page rather than letting them push things out of the way.
6. Serve your pages close to your customers. If your customers are spread across cities or countries, a CDN (content delivery network) and page caching shorten the time before a page starts to load.
A simple monthly habit
Once a month, run your home page and your most-visited pages through PageSpeed Insights and note the results. Check again whenever you add a new image, plugin or banner. Small, steady fixes usually work better than one big, late rebuild.
Sources
Web Vitals, web.dev (Google), last updated October 31, 2024
The most effective ways to improve Core Web Vitals, web.dev (Google), last updated October 31, 2024
Understanding Core Web Vitals and Google search results, Google Search Central
A fast site is like an open front door: customers walk in more easily. Have a good day.
