Core Web Vitals.
Core Web Vitals are Google's three official metrics for user-friendliness: LCP (loading time of main content), INP (response time to inputs), and CLS (visual stability). Since 2021, they are direct ranking factors. Target: LCP under 2.5s, INP under 200ms, CLS under 0.1.
Core Web Vitals — Explained in Detail
Core Web Vitals are Google's three official metrics for user experience on websites. They measure how quickly and stably a page loads and responds. The three metrics: LCP (Largest Contentful Paint) — how long does it take until the main content is visible? INP (Interaction to Next Paint) — how quickly does the page respond to user inputs? CLS (Cumulative Layout Shift) — how stable is the layout during loading? Since the Page Experience Update in 2021, all three are direct Google ranking factors.
The target values for a 'good' rating: LCP under 2.5 seconds, INP under 200 milliseconds, CLS under 0.1. These values are measured using real user data (Chrome User Experience Report / CrUX). This means: even if your website is fast in the lab, poor connections or older devices from users can lead to lower Core Web Vitals — which is why mobile optimization is so crucial.
You can measure Core Web Vitals with Google PageSpeed Insights, Google Search Console (Core Web Vitals Report), and Lighthouse. DLM Digital optimizes all projects by default for excellent Core Web Vitals: optimized images in WebP format, code splitting, server-side rendering, predefined image dimensions (no CLS), and minimal JavaScript. The result: 95–100 PageSpeed scores on both desktop and mobile.
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Webdesign ZurichFrequently Asked Questions About Core Web Vitals
Google has used Core Web Vitals as a direct ranking signal since 2021. A fast, stable website ranks — with equally strong SEO factors — better than a slow one. Additionally, good Core Web Vitals directly impact user experience: faster pages have lower bounce rates and higher conversion rates.
Lab data (Lighthouse, PageSpeed Insights simulation) measures performance under controlled conditions. Field data (Chrome User Experience Report) measures real user experiences — on various devices and connections. Google ranks based on field data. A good lab score doesn't guarantee good field values if your target audience uses slow mobile connections.
Improve LCP: optimize images (WebP, correct sizes), inline critical CSS, reduce server response time (TTFB). Improve INP: minimize JavaScript, break up long tasks, optimize React rendering. Improve CLS: set image dimensions, optimize web fonts (font-display: swap), don't insert content above existing content.
More Terms Starting with "C"
CLS (Cumulative Layout Shift)
CLS is one of Google's three Core Web Vitals and measures the visual stability of a page. It quantif...
CMS (Content Management System)
A CMS is software that allows you to create and edit website content without programming knowledge. ...
CDN (Content Delivery Network)
A CDN is a global network of servers that delivers your website files as close to the user as possib...
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