Speed screen

Speed shows how quickly pages become useful to visitors. It combines controlled lab testing with real-visitor measurements where Analytics is available.

When Analytics is recording visits, the overview includes Core Web Vitals from those visits: LCP, INP, CLS, and time to first byte. Each figure is rated good, needs improvement, or poor against Google's thresholds, so you can see how the site felt to real people rather than only how it performed in a lab run.

Lab and real-world data

Lab tests provide repeatable diagnostics for specific pages and devices. Real-user data reflects the range of networks, devices, and visitor conditions actually experienced on your site. The two can differ without either being wrong.

What to investigate

• Largest Contentful Paint (one of the Core Web Vitals) and when the main content appears.
• Layout shifts caused by images, fonts, or late-loading interface elements.
• JavaScript work that blocks interaction.
• Large images and unnecessary data transfer.
• Slow servers, third-party scripts, and render-blocking resources.

Start with high-traffic or important pages, then use the Inspector and individual checks to find concrete causes.

Learn more

• Page speed and Core Web Vitals - how to prioritise vitals work across the site