A slow website quietly costs you customers, ad dollars and search visibility. Core Web Vitals are Google’s way of measuring how fast and stable a page feels. This guide explains them in plain English and gives a practical checklist for small business sites.
The three measurements
- LCP (Largest Contentful Paint): how quickly the main content appears. Google considers about 2.5 seconds or less good.
- INP (Interaction to Next Paint): how quickly the page responds when someone taps or clicks. About 200 milliseconds or less is considered good.
- CLS (Cumulative Layout Shift): how much the page jumps around while loading. A score of 0.1 or less is considered good.
Why speed matters to a business
Visitors leave slow pages. On a phone, over cellular data, a heavy page can lose a customer before it finishes loading. Speed also influences your quality score in Google Ads, which affects what you pay, and it is one of many signals in search. Faster pages convert more of the traffic you already have.
How to check your site
Run your homepage and your most important landing page through Google’s PageSpeed Insights and review the Core Web Vitals report in Search Console, which shows real-world data. Test on an actual phone with a normal connection. Note the biggest culprits the report lists.
Key takeaways
- Core Web Vitals measure loading, interactivity and visual stability.
- Speed affects conversions, ad costs and SEO.
- Most gains come from images, scripts and hosting.
- Test on real phones, not just your desktop.
Fix the images first
Oversized images are the most common problem. Resize them to the size they display, use modern formats such as WebP, compress them and lazy-load images below the fold. Never upload a 5 MB photo straight from a camera.
Trim scripts and plugins
Every chat widget, tracker, font and slider adds weight. Remove what you do not use, load the rest after the page appears and avoid stacking several plugins that do the same job. On WordPress, a lean theme and fewer plugins help enormously.
Hosting and caching
A slow server slows everything. Good hosting, page caching and a content delivery network (CDN) make pages load faster for visitors everywhere. If your host is slow even with a clean site, it may be time to move.
Keep the layout stable
Reserve space for images and ads so the page does not jump. Set width and height on images, avoid inserting banners above content after load and load fonts carefully.
A practical checklist
- Compress and resize all images.
- Enable caching and a CDN.
- Remove unused plugins and scripts.
- Limit fonts to what you use.
- Test on mobile every time you change the site.
- Recheck monthly in Search Console.
Frequently asked questions
Do Core Web Vitals directly decide my rankings?
They are one of many signals, and relevance still matters most, but speed strongly affects conversions.
Is my builder (Wix, Squarespace, WordPress) the problem?
Not usually. Images, scripts and hosting matter more than the platform.
How fast is fast enough?
Aim for the ‘good’ thresholds on mobile and keep improving.
Can I fix this myself?
Image and plugin cleanup is doable. Hosting and code issues often need a developer.
Related reading
- Website Development — our service page
- SEO & AEO — our service page
- Marketing Analytics — our service page
- Browse client case studies
- Every marketing service we offer, explained
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