# Core Web Vitals for B2B Websites Explained | Yungle > What Core Web Vitals measure, the thresholds Google uses, and how to build a B2B website that stays fast after launch instead of fixing it later. Source: https://yungle.ai/insights/core-web-vitals-for-b2b-websites/ 1. [Resources](https://yungle.ai/resources) 2. Insights # Core Web Vitals for B2B Websites Explained What Core Web Vitals measure, the thresholds Google uses, and how to build a B2B website that stays fast after launch instead of fixing it later. _Image: Abstract diagonal streaks of orange, blue and green_ On this page 1. What do Core Web Vitals measure? 2. Why do B2B websites fail Core Web Vitals? 3. How do you build performance in instead of fixing it later? 4. How often should you check performance after launch? 5. How Yungle approaches performance 6. Frequently asked questions 2 min read **Quick answer:** Core Web Vitals are Google’s three user-experience metrics: Largest Contentful Paint (good under 2.5 seconds), Interaction to Next Paint (good under 200 milliseconds) and Cumulative Layout Shift (good under 0.1), measured on real visitors at the 75th percentile. B2B sites pass them by budgeting weight from the design phase, not by optimizing after launch. A slow website costs twice: it ranks lower and it converts worse. Most B2B sites don’t start slow. They get slow, one hero video, tracking script and uncompressed image at a time. Our rule is simple: a website shouldn’t weigh more than an apple. ## What do Core Web Vitals measure? - **Largest Contentful Paint (LCP):** how long the main content takes to appear. Good is 2.5 seconds or less. - **Interaction to Next Paint (INP):** how quickly the page responds when someone clicks, taps or types. Good is 200 milliseconds or less. - **Cumulative Layout Shift (CLS):** how much the layout jumps while loading. Good is 0.1 or less. Google evaluates them with field data from real Chrome users (the Chrome UX Report), at the 75th percentile, on mobile and desktop separately. Lab tools like Lighthouse and PageSpeed Insights help you diagnose, but the field data is what counts. See our glossary entries on [Core Web Vitals](https://yungle.ai/glossary/core-web-vitals) and [INP](https://yungle.ai/glossary/interaction-to-next-paint-inp). ## Why do B2B websites fail Core Web Vitals? The usual causes are predictable: - Hero images and videos exported at full size, without modern formats (AVIF, WebP) or responsive sizes. - Fonts loaded without `font-display` or preloading, which shifts text when they arrive. - Third-party scripts (chat widgets, tag managers, heatmaps) competing with the page on first load. - Animations that move layout properties instead of transforms. - Content added after launch by people who were never given limits. ## How do you build performance in instead of fixing it later? Treat performance as a design constraint: 1. **Set a budget per page** (weight, number of requests, LCP target) before design starts. 2. **Design the hero for speed:** one optimized image or a short muted loop with a poster, never an autoplaying heavy video. 3. **Load scripts on intent:** chat, maps and embeds load when someone needs them. 4. **Give the CMS guardrails:** image fields that resize and convert automatically, so new content can’t break the budget. 5. **Test on a mid-range phone**, not only on a fast laptop. ## How often should you check performance after launch? Monthly, at minimum, and after every content or tracking change. Performance decays quietly. In [Growth](https://yungle.ai/pricing) we track field data and Lighthouse scores every month and fix regressions before they show up in rankings. ## How Yungle approaches performance We hold every page we ship to 90+ in Lighthouse for performance, accessibility and best practices, on mobile and desktop, and we keep the CMS from undoing it. If your current site feels heavy, a [Free Growth Audit](https://yungle.ai/contact) will show you where the weight is. ## Frequently asked questions **Do Core Web Vitals affect rankings?** They are part of Google’s page experience signals. They rarely beat relevance, but between similar pages the faster one has the edge, and it converts better either way. **Is a 100 in Lighthouse required?** No. Field data passing the three thresholds matters more than a perfect lab score. [Jorge Sahagún Founder · Yungle](https://www.linkedin.com/in/jorgesahagunniebla/) Updated OCT 2026 Share - [LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fyungle.ai%2Finsights%2Fcore-web-vitals-for-b2b-websites) - [X](https://x.com/intent/post?url=https%3A%2F%2Fyungle.ai%2Finsights%2Fcore-web-vitals-for-b2b-websites&text=Core%20Web%20Vitals%20for%20B2B%20Websites%20Explained) - Field notes ## One email a month. What we learn building websites. Related resources - Glossary [Core Web Vitals](https://yungle.ai/glossary/core-web-vitals) - FAQ [How Fast Should My Website Load?](https://yungle.ai/resources?type=faq#how-fast-should-my-website-load) - Insight · 2 min read [SEO and AEO Checklist Before You Launch](https://yungle.ai/insights/seo-aeo-checklist-before-launching-a-website) Next step ## Let's talk _Image: Engraving of a jungle panorama with mountains_ Inspired by Tulum, QROO, MX