Core Web Vitals in 2026: why a slow website quietly costs you enquiries
Visitors decide in seconds. Google's three speed and stability scores tell you whether your site is helping or hurting — here is how to read and fix them
Most visitors never tell you your website is slow. They simply leave. On mobile data, a heavy homepage can take several seconds to show anything useful — long enough for a potential customer to hit back and tap the next result.
Google measures this real-world experience with three Core Web Vitals. They are a ranking signal, but more importantly they are a good proxy for whether people can actually use your site.
The three numbers
- LCP — Largest Contentful Paint. How long until the main content (usually the hero image or headline) appears. Good: 2.5 seconds or less.
- INP — Interaction to Next Paint. How quickly the page responds when someone taps a button or opens a menu. Good: 200 milliseconds or less. INP replaced the older FID metric in 2024 and is stricter.
- CLS — Cumulative Layout Shift. How much the page jumps around while loading. Good: 0.1 or less. This is the "I tapped the wrong button because the page moved" problem.
You can see your scores for free in Google Search Console and PageSpeed Insights. Focus on the mobile numbers; that is where most of your visitors are.
Fixes that usually help most
- Images. Serve modern formats such as WebP or AVIF, size them for the screen, and lazy-load anything below the fold. Unoptimised hero images are the most common cause of poor LCP.
- Fewer third-party scripts. Every chat widget, tracking pixel and pop-up tool adds weight. Remove what you do not use; load the rest after the page is interactive.
- Reserve space. Give images, videos and embeds fixed dimensions so content does not jump.
- Fonts. Self-host one or two font families and load them efficiently.
- Good hosting and caching. Serve pages from a fast server or CDN close to your visitors.
- Lighter interactions. Heavy animations and large JavaScript bundles are the usual cause of poor INP.
Speed and beauty are not opposites
A premium-looking site can be fast. The secret is planning the design around the content it will hold, compressing media at upload, and being deliberate about every script you add.
Check your Core Web Vitals once a quarter, after every redesign and after adding any new tool. A fast, steady website is one of the cheapest conversion improvements available — every visitor you already paid to attract gets a better chance to become an enquiry.
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