Suggest an editImprove this articleRefine the answer for “What is PageSpeed Insights?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)**PageSpeed Insights** is a free tool from Google that analyzes a web page and shows its loading speed, Core Web Vitals values, and recommendations for improvement. **Key point:** it uses two types of data - Field data (real users) and Lab data (emulation in Lighthouse).Shown above the full answer for quick recall.Answer (EN)Image**PageSpeed Insights** is a free tool from Google that analyzes a web page and shows: --- ### 1. **Loading speed** Broken down into scores for **mobile** and **desktop**, rated from 0 to 100. The higher the score, the better the optimization. --- ### 2. **Core Web Vitals** Shows the values of the metrics: **LCP**, **FID** (or its replacement, INP), **CLS** - and indicates whether they meet the targets. --- ### 3. **Recommendations** Detailed advice: - which resources slow down loading, - what can be compressed, - where to remove unnecessary JavaScript, - which images are oversized, etc. --- ### 4. **Two types of data:** - **Field data** (real users) - from Chrome reports; - **Lab data** (emulation) - from Lighthouse, to test under controlled conditions. --- In short, it's a tool that shows **what's stopping your site from being fast, stable, and convenient**, and how to fix it.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.