Core Web Vitals Explained: How to Make Your Website Fast and Why Google Cares

Every extra second a page takes to load is a second for your visitor to tap back and choose a competitor. Google formalised this with Core Web Vitals, three measurements of how fast and stable your pages feel to real people. You do not need to be a developer to understand them, and the fixes are often simpler than you expect.

#What are Core Web Vitals?

Core Web Vitals are three metrics Google uses to measure real-world page experience: loading, responsiveness and visual stability. They are collected from real Chrome users visiting your site, so they reflect actual phones and networks, not a lab test on a fast computer.

#What is Largest Contentful Paint and how do you improve it?

LCP is the moment the biggest visible element, usually a hero image or headline, finishes rendering. It is the metric visitors feel most.

Improve it by:

• Serving images in modern formats such as WebP or AVIF, sized for the screen
• Preloading the hero image and never lazy-loading it
• Using fast hosting with a content delivery network
• Reducing render-blocking CSS and JavaScript
• Loading web fonts efficiently with sensible fallbacks

#What is Interaction to Next Paint and how do you improve it?

INP measures how long the page takes to visibly respond after someone taps, clicks or types. A slow INP makes a site feel broken even if it loaded quickly.

Improve it by:

• Shipping less JavaScript, especially from page builders and unused plugins
• Breaking long scripts into smaller tasks
• Delaying non-essential third-party scripts such as chat widgets until they are needed
• Avoiding heavy work on every scroll or keystroke

#What is Cumulative Layout Shift and how do you improve it?

CLS measures how much content jumps around while the page loads. You have felt it when a button moves just as you tap it.

Improve it by:

• Setting width and height (or an aspect ratio) on every image and video
• Reserving space for ads, embeds and banners
• Avoiding content injected above what the visitor is reading
• Loading fonts in a way that does not reflow text dramatically

#How do you test your Core Web Vitals?

Use field data first, lab data second.

1. Google Search Console shows real-user Core Web Vitals across your site, grouped by page type.
2. PageSpeed Insights shows real-user data for a URL plus a lab test with specific suggestions.
3. Chrome DevTools helps developers trace exactly what slows a page.

Focus on your highest-traffic templates first: homepage, top service or product pages and blog articles.

#Which website platforms are fastest?

Any platform can be fast or slow; the build quality decides. A lean custom site or a well-built WordPress theme can both score well. Heavy page builders, stacks of plugins and unoptimised images are the usual problems. We compare platforms in Next.js vs WordPress vs Webflow.

#Do Core Web Vitals matter for SEO and conversions?

They matter for both, and more for conversions. Google uses page experience as a ranking signal, but relevance and content quality still lead. The bigger win is commercial: faster pages keep visitors on the site, reduce bounce and make checkouts and enquiry forms easier to finish.

#What is a sensible order of fixes?

#Want a faster website?

Speed is built into every website we make, from image pipelines to lean code. If your current site is slow, we can audit it and fix the biggest issues first. Explore our website development and technical SEO services, or request a speed review.