What this speed test measures
We load your homepage in a lab test on a simulated phone and on desktop, score its performance, accessibility, best practices and SEO, and add real-user data when your site has enough visitors.
| Metric | What it means | Good |
|---|---|---|
| Largest Contentful Paint | When the main content has loaded | under 2.5 s |
| Interaction to Next Paint | How fast the page reacts to taps and clicks | under 200 ms |
| Cumulative Layout Shift | How much the layout jumps while loading | under 0.1 |
| First Contentful Paint | When the first text or image appears | under 1.8 s |
| Total Blocking Time | How long scripts block the page (lab) | under 200 ms |
Quick ways to speed up your site
- Compress and resize images, and serve them as WebP or AVIF.
- Use a CDN and caching so pages are served from close to your visitors.
- Cut unused JavaScript, especially third-party widgets, chat bubbles and trackers.
- Reserve space for images and ads so the layout doesn’t jump.
- Pick fast hosting. A slow server response delays everything else.
Website speed test FAQ
Where do the speed scores come from?
From a lab test that loads your homepage on a simulated phone and on desktop, plus real-user Core Web Vitals when the site has enough visitors.
What is a good speed score?
90 to 100 is good, 50 to 89 needs improvement and below 50 is poor. Mobile scores are usually lower than desktop because the test simulates a slower phone and network.
Why does my score change between tests?
Lab tests vary a little with server load and network conditions. Look at the trend and at the real-user data rather than one exact number.
What are Core Web Vitals?
The three user-experience metrics search engines care about most: Largest Contentful Paint (loading), Interaction to Next Paint (responsiveness) and Cumulative Layout Shift (visual stability).