Want to know if your website is fast enough? Here's how to test it properly - using free tools that give you actionable information.
The Best Free Speed Testing Tools
1. Google PageSpeed Insights (Most Important)
URL: pagespeed.web.dev
This is Google's own tool, and the one that matters most for SEO. It shows you exactly what Google sees when it evaluates your site.
What it tells you:
- Your Core Web Vitals scores (LCP, INP, CLS)
- A performance score from 0-100
- Specific issues to fix
- The estimated impact of each fix
Key tip: Look at the "Field Data" section if available - this shows real performance data from actual Chrome users. "Lab Data" is a simulation; Field Data is reality.
2. GTmetrix
URL: gtmetrix.com
GTmetrix provides more detailed waterfall charts showing exactly what loads and when. Useful for diagnosing specific issues.
What it tells you:
- Performance scores
- Detailed loading waterfall
- Largest Contentful Paint filmstrip
- Structure and recommendations
Key tip: Create a free account to test from UK servers (default is Canada, which adds latency for UK-based sites).
3. WebPageTest
URL: webpagetest.org
The most detailed tool, used by developers. Overkill for most business owners but useful if you need deep analysis.
What it tells you:
- Frame-by-frame loading filmstrip
- Advanced metrics
- Multi-step testing
- Connection throttling options
4. Chrome DevTools (Built into Chrome)
Right-click any page, select "Inspect", then click the "Lighthouse" tab. Run an audit directly in your browser.
What it tells you:
- Performance score
- Accessibility issues
- Best practices
- SEO basics
Key tip: Use an incognito window to avoid browser extensions affecting results.
How to Test Properly
Step 1: Test Mobile First
Most local searches happen on mobile. Google uses mobile performance for rankings. Always check your mobile score before desktop.
In PageSpeed Insights, mobile is shown by default. The scores are typically lower than desktop - that's normal.
Step 2: Test Multiple Pages
Don't just test your homepage. Check:
- Homepage - Often the fastest (most optimised)
- Service pages - May have more images and content
- Blog posts - Often image-heavy
- Contact page - Usually fast (simple content)
If your homepage scores 85 but your service pages score 45, you have a problem visitors will experience.
Step 3: Test From the Right Location
If your business serves UK customers, test from UK servers. GTmetrix lets you choose test location. PageSpeed Insights uses Google's global infrastructure but Field Data reflects your actual visitors.
Step 4: Test Multiple Times
Scores can vary slightly between tests due to server load and network conditions. Run 2-3 tests and look for consistent patterns rather than obsessing over a single score.
Understanding Your Scores
The Performance Score (0-100)
| Score | Rating | What It Means |
|---|---|---|
| 90-100 | Good (Green) | Your site is fast. Well done. |
| 50-89 | Needs Improvement (Orange) | Room for improvement. You're losing some visitors. |
| 0-49 | Poor (Red) | This is actively hurting your business. Take action. |
What's Realistic?
- Custom-built sites: Often score 90+
- Well-optimised WordPress: Typically 70-90
- Average WordPress: Usually 50-70
- Wix/Squarespace: Typically 50-75 on mobile
- Unoptimised sites: Often below 50
Don't compare yourself to Google's homepage. Compare yourself to your competitors.
Reading the Diagnostics
PageSpeed Insights shows opportunities and diagnostics. Here's how to prioritise:
High Impact (Fix First)
- Serve images in next-gen formats - Switch to WebP
- Properly size images - Don't load 4000px images for 400px spaces
- Eliminate render-blocking resources - Scripts blocking the page from loading
- Reduce unused JavaScript - Code that loads but isn't used
Medium Impact
- Enable text compression - Server configuration
- Preconnect to required origins - Technical optimisation
- Serve static assets with efficient cache policy - Server configuration
Lower Impact (But Still Helpful)
- Avoid multiple page redirects - Each redirect adds delay
- Minify CSS/JavaScript - Remove unnecessary characters from code
- Avoid enormous network payloads - General page weight
The Testing Workflow
Here's a practical approach to speed testing:
Initial Baseline
- Test your homepage on PageSpeed Insights
- Note your mobile Core Web Vitals (LCP, INP, CLS)
- Screenshot or save the report
- Test 2-3 other important pages
After Making Changes
- Wait for changes to deploy (and clear any caching)
- Run the same tests
- Compare before/after scores
- Check if Field Data updates (this takes weeks as Google collects new data)
Monthly Check
- Quick test of key pages
- Note any score drops
- Investigate if scores have worsened significantly
Common Mistakes When Testing
Testing Only the Homepage
Your homepage is often your fastest page because it gets the most attention. Test the pages visitors actually use.
Testing on Fast WiFi
PageSpeed Insights simulates slower connections automatically. But when you manually browse your site, do it on your phone with mobile data to feel what visitors experience.
Obsessing Over Perfect Scores
The difference between 85 and 100 is marginal. Focus on getting out of the red, not achieving perfection.
Ignoring Mobile
Desktop scores are almost always higher. Mobile is what matters for most local businesses.
Testing Once and Forgetting
Speed degrades over time as you add content, plugins, and features. Make testing a regular habit.
What to Do With Your Results
Once you've tested, you'll likely find issues to address. Here's how to proceed:
Easy Wins (Do Yourself)
- Compress images before uploading
- Remove plugins/apps you're not using
- Reduce the number of fonts you're loading
Moderate Difficulty
- Switch to a faster hosting provider
- Enable caching (if your platform supports it)
- Optimise your largest images
Requires Professional Help
- Code optimisation and minification
- Server configuration (CDN, caching rules)
- Fixing render-blocking resources
- Core architectural issues
The Bottom Line
Regular speed testing is essential for maintaining a healthy website. Use Google PageSpeed Insights as your primary tool, always check mobile scores, and test more than just your homepage.
Don't chase perfect scores - focus on fixing the biggest issues first and getting all metrics into the green. And remember: real improvement matters more than impressive numbers.
Test your site now at pagespeed.web.dev and see where you stand.