Optimise images
Large images are a common cause of slow loading, so serve them at the right size and in a modern format.
- Compress and resize
- Use WebP or AVIF
- Lazy-load lower images
Page Speed Checker: How Fast Does Your Site Load on Mobile?
Get your free mobile speed score from Google Lighthouse. Add your email to unlock every speed metric and the fixes ordered by impact.
The metrics
What our page speed checker measures
The page speed checker runs Google Lighthouse on a simulated mobile device and reports five timing and stability metrics. Here's what each one means and what to aim for.
| Metric | What it tells you | Good on mobile | Poor on mobile |
|---|---|---|---|
| Largest Contentful Paint (LCP) | When the main content has appeared | 2.5 seconds or less | Over 4 seconds |
| First Contentful Paint (FCP) | When the first text or image appears | 1.8 seconds or less | Over 3 seconds |
| Total Blocking Time (TBT) | How long scripts stop the page responding | 200 ms or less | Over 600 ms |
| Cumulative Layout Shift (CLS) | How much the layout jumps while loading | 0.1 or less | Over 0.25 |
| Speed Index | How quickly the page visibly fills in | 3.4 seconds or less | Over 5.8 seconds |
Targets from Google's Core Web Vitals and Lighthouse scoring guides. Speed scores: 90 to 100 is good, 50 to 89 needs improvement, and 0 to 49 is poor.
Read your result correctly
What a page speed checker can and can't show
This is a lab test: one controlled run on a simulated phone. It's great for finding problems, but it isn't the same as what your real visitors experience on their own devices and connections.
Interaction to Next Paint (INP), the third Core Web Vital, needs real user interactions, so a lab test can't measure it. Total Blocking Time is the closest lab signal.
Scores can also move between runs because of server load, ads and network routing. So don't chase one number. Look at the trend over several tests.
Common fixes
How to make a slow page faster
Your report ranks the fixes by impact for your page. These are the ones that come up most often.
Reduce JavaScript
Heavy scripts keep the page busy and raise Total Blocking Time.
- Remove unused plugins
- Delay non-essential scripts
- Review third-party tags
Trim your CSS and fonts
Files that block rendering delay the first thing a visitor sees.
- Remove unused CSS
- Limit font families
- Use font-display swap
Use caching and a CDN
Saved copies of your pages and files can reach visitors much faster.
- Page and browser caching
- Content delivery network
- Text compression
Improve your hosting
If the server responds slowly, every other metric starts late.
- Faster server response
- Current PHP version
- Database clean-up
Stop layout jumps
Reserve space so content doesn't move while the page loads.
- Set image dimensions
- Reserve space for ads
- Avoid late banners
Want the details? Read our website speed optimization guide. Prefer to hand this over? Our support team handles speed work, and our web developers can rebuild pages that are too slow to fix.
How it works
How to test your page speed
- 1
Enter a page address
Test the pages that matter most, such as your homepage, top service page or a product page.
- 2
Get your speed score
See your free mobile speed score, Largest Contentful Paint and a count of speed issues.
- 3
Unlock the details
Add your email to see all five metrics and the fixes ordered by impact, plus your full SEO report.
- 4
Fix and test again
Results are saved for up to 6 hours, so allow some time before you test the same page again.
FAQ
Page speed checker questions, answered
Is this page speed checker free?
Yes. Your mobile speed score is free with no signup. Your email unlocks every metric and fix, and see our privacy policy for how we handle it.
Does it test desktop speed?
No, it tests mobile only. Mobile is usually the harder test, and Google mainly uses the mobile version of a page for indexing and ranking.
What's a good page speed score?
In Lighthouse, 90 to 100 is good, 50 to 89 needs improvement and 0 to 49 is poor. Treat 90 as a target rather than a requirement, because the score depends on the type of page.
Why is my score different from another speed test?
Tools use different test devices, locations and connections, and results can vary between runs. Compare tests from the same tool over time.
Does page speed affect my Google ranking?
It's one of many factors, and usually a smaller one than having the most helpful content. A fast page also gives visitors a better experience, so it's worth improving.
Why does my site feel fast but score low?
You probably have a fast device and connection, and your browser may have saved parts of your site. The test simulates a mobile device on a slower connection, loading the page fresh.
Want a faster site?
Let our developers handle the speed work
Book a free 30-minute call. Share your results and we'll tell you honestly what's worth fixing.
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