Core Web Vitals Explained: Why Site Speed Is a Marketing Issue

Website speed used to be seen as a technical detail. Today it’s a marketing issue. Slow, jumpy pages frustrate visitors, reduce conversions and can affect how you appear in search. Google’s Core Web Vitals give you a practical way to measure the experience real users have on your site.

The three Core Web Vitals

• Largest Contentful Paint (LCP) — how quickly the main content (usually a hero image or headline) appears.
• Interaction to Next Paint (INP) — how quickly the page responds when someone taps, clicks or types.
• Cumulative Layout Shift (CLS) — how much the page jumps around while loading, such as buttons moving just as you try to tap them.

Why marketers should care

Every ad click, email and social post you pay for lands on a web page. If that page is slow or unstable, some visitors leave before they ever see your offer. Improving the experience means more of your traffic has the chance to convert — and page experience is one of many signals search engines consider.

How to measure

• PageSpeed Insights shows real-user data (where available) and lab tests for any URL.
• Google Search Console reports Core Web Vitals across your whole site.
• Test your most important pages first: homepage, top landing pages, product pages and checkout.

Common fixes

For faster loading (LCP)

• Compress and resize images; use modern formats like WebP or AVIF.
• Make sure the main hero image loads early, not lazily.
• Use quality hosting and a content delivery network.

For better responsiveness (INP)

• Remove unused scripts, plugins and third-party tags.
• Delay non-essential scripts such as chat widgets until after the page loads.

For stability (CLS)

• Set width and height on images and videos so space is reserved.
• Avoid inserting banners or pop-ups above existing content.
• Load web fonts in a way that doesn’t cause text to jump.

Make it part of your process

Performance tends to decline as new features, tags and images are added. Check Core Web Vitals after every major change and review them monthly.

Every website we build is designed for speed and stability from the start. Explore our technology services.