# What Are Core Web Vitals? LCP, INP and CLS > Core Web Vitals are Google’s three measures of real page experience: loading (LCP), responsiveness (INP) and visual stability (CLS), with the targets for each. Source: https://pentaclay.com/glossary/core-web-vitals Glossary # What are Core Web Vitals? Core Web Vitals are three measurements Google uses to judge the real-world experience of a web page: Largest Contentful Paint (loading), Interaction to Next Paint (responsiveness) and Cumulative Layout Shift (visual stability). Also called CWV, LCP, INP and CLS ## The three metrics - **Largest Contentful Paint (LCP):** how long the biggest image or text block takes to appear. Good is 2.5 seconds or less - **Interaction to Next Paint (INP):** how quickly the page responds to clicks, taps and typing. Good is 200 milliseconds or less. INP replaced First Input Delay in March 2024 - **Cumulative Layout Shift (CLS):** how much the layout jumps around while loading. Good is 0.1 or less ## Field data vs lab data Google judges a page by field data: measurements from real Chrome users, collected in the Chrome User Experience Report. A page passes when at least 75% of visits meet the “good” threshold for each metric. Lab tools such as Lighthouse and PageSpeed Insights’ lab score simulate one load on one device; they are useful for finding problems but are not what Google uses for ranking. Low-traffic pages may not have enough field data, in which case Google looks at data for the whole site. ## Why it matters for B2B websites Core Web Vitals are part of Google’s page experience signals. They rarely outrank relevance, but between two similar pages the faster, steadier one has an edge. The bigger effect is on people: a buyer opening your site from a LinkedIn post on a phone will not wait for a slow hero video, and a button that jumps as they tap it costs trust. ## Common causes of poor scores - Large uncompressed hero images or autoplay video - Third-party scripts: chat widgets, tag managers, heatmaps - Web fonts loading late and swapping - Images and embeds without set width and height - Heavy JavaScript running on every click ## How we handle it We size and compress images, reserve space for media, load third-party scripts late and keep JavaScript to what a page needs. After launch we watch field data in Search Console rather than chasing a lab score. Our [website maintenance](https://pentaclay.com/services/website-maintenance) plans include keeping an eye on these numbers as content and scripts are added. Read next - [Website maintenance](https://pentaclay.com/services/website-maintenance) - [Free Website Audit](https://pentaclay.com/free-website-audit) Last updated 15 November 2026 Related terms ## Terms that go with Core Web Vitals - [Static site generation (SSG) Static site generation (SSG) is a way of building a website in which every page is turned into a finished HTML file ahead of time, during a build step, so the server only has to send ready-made files when someone visits.](https://pentaclay.com/glossary/static-site-generation) - [Server-side rendering (SSR) Server-side rendering (SSR) is a way of delivering web pages in which the server builds the complete HTML for a page when it is requested, so the browser, search engines and AI crawlers receive the full content straight away.](https://pentaclay.com/glossary/server-side-rendering) - [Conversion rate optimization (CRO) Conversion rate optimization (CRO) is the practice of increasing the share of website visitors who take a valuable action, such as booking a demo, starting a trial or contacting sales, by improving the pages they see.](https://pentaclay.com/glossary/conversion-rate-optimization) - [Landing page A landing page is a web page designed around a single audience and a single action, such as booking a demo or downloading a report, usually built for visitors arriving from a specific campaign, ad or search.](https://pentaclay.com/glossary/landing-page) [All glossary terms](https://pentaclay.com/glossary) ## Questions about Core Web Vitals ### Can’t find your answer? Book a call and let’s talk. [Book a call](https://cal.com/pentaclay/discovery-call) Or email us at [contact@pentaclay.com](mailto:contact@pentaclay.com) Are Core Web Vitals a ranking factor? Yes, as part of Google’s page experience signals, but a modest one. Relevant, helpful content still matters more. Treat good vitals as a baseline, not a growth strategy. Why is my PageSpeed score different every time? The lab score simulates a single load and varies with network and server conditions. The field data section at the top of PageSpeed Insights, based on real visits over 28 days, is the steadier number. What replaced First Input Delay? Interaction to Next Paint (INP) replaced First Input Delay (FID) as a Core Web Vital in March 2024. INP measures responsiveness across all interactions on a page, not just the first. Do Framer and Webflow sites pass Core Web Vitals? They can. Both host on fast global networks, so most problems come from what is added on top: large images, video, animations and third-party scripts. ## Your business grew up. Your website should too If customers need a demo just to understand what you sell, your website isn’t doing its job. - We sign an NDA on request. - You own the site, the code and every account once it’s paid. - Your first call is with Erfan, the founder. **Kazi Mohammed Erfan** Founder Don’t want to fill in the form? [Book a call directly](https://cal.com/pentaclay/discovery-call) ## Not sure? Ask AI about Pentaclay ### Pentaclay, in short Updated 17 Oct 2026 Pentaclay is a B2B website design agency for AI companies that sell to enterprises. We write, design and build marketing websites in Framer, Webflow and Next.js, and stay to help after launch. Pentaclay LLC is registered in New Mexico, USA; our team works from Dhaka, Bangladesh, with calls until 12:30pm US Eastern. Founded in 2023 by Kazi Mohammed Erfan, who brings 12 years of design experience.