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What the numbers mean

This tool calls the same PageSpeed Insights API behind Google's own PageSpeed report. It runs a Lighthouse test on your page and hands back five numbers. None of them are rankings.

They tell you how fast and how steady the page is for someone on a mid-range phone with a slow connection. That is the test Google runs. Not the one on your office fiber.

Performance score

A 0 to 100 grade built from the lab metrics below. Lighthouse calls 90 to 100 good, 50 to 89 needs improvement, and 0 to 49 poor. The score moves between runs because server load and network change, so run it three times and trust the middle one.

LCP, CLS and INP (Core Web Vitals)

• LCP (Largest Contentful Paint) is how long the biggest thing on screen takes to show up. Good is 2.5 seconds or under. The usual suspects: slow hosting, giant hero images, and scripts that block the page.
• CLS (Cumulative Layout Shift) is how much the page jumps around while it loads. Good is 0.1 or under. Images with no width and height, late fonts, and banners that drop in cause it.
• INP (Interaction to Next Paint) replaced FID as the responsiveness metric in March 2024. Good is 200 milliseconds or under. When Google has no INP field data for your URL, this tool shows FID from the lab run instead.

TTFB

Time to First Byte is how long your server takes to start answering. Google says 800 milliseconds or under. It sits under every other number: a slow TTFB drags LCP down before a single pixel shows.

Google uses Core Web Vitals as a page experience signal, and it grades you on field data from real Chrome users, not the lab run you see here. Green lab score, poor field data? Real visitors on slower phones are having a worse time than the test says.

If your numbers are poor, fix in this order. Hosting and image weight first. Then scripts, then fonts.