Glossary

Core Web Vitals

Core Web Vitals are three Google metrics that measure how fast and stable your pages feel to real users. They affect both SEO rankings and conversion rate. Sites with poor scores typically convert 20 to 40 percent worse than fast ones on the same traffic.

The three metrics that matter

Largest Contentful Paint should be under 2.5 seconds. It measures how fast the main content appears. Interaction to Next Paint should be under 200 milliseconds. It measures how quickly the page reacts to clicks. Cumulative Layout Shift should be under 0.1. It measures whether content jumps around as the page loads.

Real-world data is what Google scores, not lab data. Use the Search Console Page Experience report to see how your site is performing for actual visitors over the last 28 days.

The three fixes that move scores most

Compress and lazy-load images. Most service sites have hero images that are five times bigger than they need to be. Defer third-party scripts like chat widgets and analytics. Set explicit width and height on images and embeds to stop layout shift.

These three usually take a developer one day and move scores from poor to good. Big rewrites are rarely needed. The complicated optimizations come last, not first.

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