Core Web Vitals: How to Make Your Website Faster and Rank Higher on Google

A slow website costs money. Every extra second of loading time raises the bounce rate and lowers conversions. In addition, Google uses page experience as one of its ranking signals. That is why core web vitals have become essential metrics for anyone investing in SEO and digital marketing.

In this guide, we explain each metric, show how to measure it and list the optimizations that deliver the biggest results.

What are core web vitals

Core Web Vitals are a set of three metrics created by Google to measure real user experience. They evaluate a page's loading, interactivity and visual stability.

LCP: Largest Contentful Paint

Measures how long the largest visible element, usually a hero image or a headline, takes to appear. Target: 2.5 seconds or less.

INP: Interaction to Next Paint

Measures the time between an interaction, such as a click, and the page's visual response. Since 2024, INP has replaced the old FID metric. Target: 200 milliseconds or less.

CLS: Cumulative Layout Shift

Measures how much the layout "jumps" while loading. Anyone who has clicked the wrong button because an ad pushed the content down knows this problem well. Target: 0.1 or less.

How to measure the metrics

• PageSpeed Insights: shows real-user data from Chrome plus a lab diagnosis.
• Google Search Console: the Page Experience report groups URLs with issues.
• Lighthouse: built into Chrome DevTools and ideal for testing during development.
• The web-vitals library: collects metrics from your own visitors and sends them to Google Analytics.

One important point: Google relies on field data, meaning real users. Therefore, a high Lighthouse score does not guarantee a pass if your visitors use slow phones.

How to improve LCP

1. Optimize images: use modern formats such as WebP and AVIF and size each image to its display dimensions.
2. Prioritize the hero image: apply fetchpriority="high" and never lazy-load the top image.
3. Reduce server response time: use page caching, a CDN and adequate hosting.
4. Remove render-blocking resources: load critical CSS first and defer non-essential scripts.

How to improve INP

1. Ship less JavaScript: remove unused libraries and split code into smaller chunks.
2. Break up long tasks: functions that block the main thread for more than 50 ms hurt responsiveness.
3. Control third-party scripts: chat widgets, pixels and embeds are often the biggest culprits. Evaluate which ones actually pay off.

How to improve CLS

1. Set width and height on images, videos and iframes.
2. Reserve space for banners, ads and late-loading content.
3. Load fonts properly with font-display: swap and preloading for key fonts.

The real impact on digital marketing

Speed directly affects campaign costs. Fast landing pages earn better Quality Scores in Google Ads, which can lower cost per click. Moreover, Google's own research shows that the probability of bounce rises by more than 30% when load time goes from one to three seconds.

In other words, improving Core Web Vitals boosts SEO, paid media and conversion at the same time.

Frequently asked questions

Are Core Web Vitals a ranking factor?

Yes, they are part of the page experience signals. Still, relevant content remains the most important factor.

How long does Google take to recognize improvements?

Field data uses a 28-day window. For that reason, changes show up gradually in Search Console.

Conclusion

Core web vitals turn the experience your visitors feel into numbers. Measure with real data, tackle images and third-party scripts first and track progress in Search Console. If your website needs a full performance overhaul, WDS Developer can help.