Suggest an editImprove this articleRefine the answer for “What are Core Web Vitals?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)**Core Web Vitals** are a set of metrics from Google that assess how comfortable it is for a user to interact with a site. **Key point:** these metrics directly affect SEO and are checked by Google, especially on mobile.Shown above the full answer for quick recall.Answer (EN)Image**Core Web Vitals** are a set of metrics from Google that assess how comfortable it is for a user to interact with a site. These metrics directly affect SEO. Here are the three main ones: --- ### 1. **LCP (Largest Contentful Paint)** **What it measures:** how many seconds it takes for the page's main content to load. **Good:** up to 2.5 seconds. **Why:** if the heading or image appears with a delay, the user leaves. --- ### 2. **FID (First Input Delay)** **What it measures:** the delay between the user's first action (click, tap) and the page's response. **Good:** up to 100 ms. **Why:** if a button responds with lag, the site feels "sluggish." --- ### 3. **CLS (Cumulative Layout Shift)** **What it measures:** how much the layout "jumps" during loading. **Good:** up to 0.1. **Why:** if text or buttons shift, a person may click the wrong thing - it's annoying. --- All of these metrics are checked by Google and can be decisive in ranking. Especially on mobile.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.