Speed reports list dozens of numbers. Three tell you most of what you need: how fast the main content shows, how quickly the page responds and whether things jump around.
Key takeaways30-second version
✓Largest Contentful Paint. How long until the biggest thing on screen appears.✓Interaction to Next Paint. How quickly the page reacts when someone taps.✓Cumulative Layout Shift. How much the page moves while loading. 01 Largest Contentful Paint
How long until the biggest thing on screen appears. Aim for under 2.5 seconds on a phone.
the three numbers that matter.
02 Interaction to Next Paint
How quickly the page reacts when someone taps. Slow scripts are the usual cause.
03 Cumulative Layout Shift
How much the page moves while loading. Set sizes on images and ads to stop it.
