Website Speed Test & PageSpeed Analyzer
Enter a public website URL to generate a real-time Google Lighthouse & Core Web Vitals audit for Mobile and Desktop.
Form Factor Comparison Matrix
| Metric / Category | 📱 Mobile | 💻 Desktop |
|---|
Real-User Experience (Field Data)
Aggregated metrics collected from real Chrome users over the last 28 days (Chrome User Experience Report).
Core Web Vitals (Lab Data)
Lab Performance Metrics
⚡ Opportunities & Top Issues (0)
🔍 Diagnostics (0)
🌐 Network Requests & Resource Details
| Resource URL | Type | Transfer Size |
|---|
♿ Accessibility Audits
🛡️ Best Practices Audits
🔎 SEO Audits
Note: SEO checks are based on basic Lighthouse technical audits and do not replace a full SEO audit.
✅ Passed Audits (0)
⚙️ Technical Environment Details
Test your website performance with the PageSpeed Optimization Tester. Enter a public webpage URL to check mobile and desktop performance, Core Web Vitals, loading metrics, accessibility, best practices, SEO audits, opportunities, diagnostics, and other technical performance information.
Whether you want to test a WordPress website, blog, online store, landing page, or another public webpage, this website speed test helps you identify performance issues that may affect loading speed and user experience.
Free Website Speed Test
A slow website can make it harder for visitors to use your pages, especially on mobile devices and slower connections. A performance test can help you understand what is happening before you start making optimization changes.
Enter the URL of the page you want to analyze and run the test. The report provides separate mobile and desktop results so you can see how the same page performs in different testing environments.
Our PageSpeed Optimization Tester checks important areas including:
- Performance score
- Mobile performance
- Desktop performance
- Core Web Vitals
- Largest Contentful Paint (LCP)
- Interaction to Next Paint (INP)
- Cumulative Layout Shift (CLS)
- First Contentful Paint (FCP)
- Speed Index
- Total Blocking Time (TBT)
- Opportunities
- Diagnostics
- Network requests
- Accessibility
- Best Practices
- SEO-related technical audits
What Does a PageSpeed Optimization Tester Check?
A PageSpeed optimization test looks at several technical aspects of a webpage rather than relying on a single speed number.
Performance Score
The performance score provides a quick overview of how the tested page performed during the audit. Use the score as a starting point rather than the only measure of website quality.
Core Web Vitals
Core Web Vitals focus on important aspects of loading, responsiveness, and visual stability. The main metrics are LCP, INP, and CLS.
Mobile Performance
Check how the webpage performs under mobile testing conditions and identify resources or technical issues that may affect mobile visitors.
Desktop Performance
Review desktop performance separately and compare it with mobile results to identify differences between testing environments.
Core Web Vitals Explained
Core Web Vitals are user-focused performance metrics that evaluate important aspects of loading, responsiveness, and visual stability.
LCP – Largest Contentful Paint
LCP measures how quickly the largest visible content element becomes available to the user.
INP – Interaction to Next Paint
INP measures how responsive a webpage is to user interactions. A page that responds quickly can provide a smoother experience.
CLS – Cumulative Layout Shift
CLS measures unexpected movement of visible content while a webpage is loading.
First Contentful Paint
FCP measures when the browser first renders meaningful content on the screen.
Mobile vs Desktop PageSpeed Test
A website can perform differently on mobile and desktop. A page that feels fast on a powerful desktop computer may still have slower loading or interaction performance under mobile conditions.
| Test | What It Helps You Understand |
|---|---|
| Mobile | Performance under mobile testing conditions |
| Desktop | Performance under desktop testing conditions |
| Core Web Vitals | Loading, responsiveness, and visual stability |
| Opportunities | Potential areas where performance could be improved |
| Diagnostics | Technical information about detected performance conditions |
What Is a Good PageSpeed Score?
PageSpeed scores are commonly grouped into three ranges:
However, chasing a perfect 100 score should not be the only goal of website optimization. A useful performance audit should help you understand the actual problems affecting the page.
Focus on meaningful improvements that make your website faster, more responsive, and easier to use instead of optimizing only for a single number.
Why Is My Website Slow?
There are many possible reasons why a website loads slowly. A PageSpeed audit can help narrow down the areas that need attention.
Large Images
Large or poorly optimized images can increase page weight and delay loading. Use appropriately sized images and modern formats where appropriate.
Too Much JavaScript
Large JavaScript files or scripts that run for too long can increase main-thread work and delay interaction.
Unused CSS and JavaScript
A page may load resources that are not required for the content being displayed. Reducing unnecessary resources can decrease page weight.
Render-Blocking Resources
Some CSS and JavaScript resources can delay the browser from rendering important content.
Third-Party Scripts
Analytics, advertising, chat widgets, tracking tools, and other third-party services can add requests and processing work.
Slow Server Response
Hosting performance, server configuration, caching, database processing, and application code can all affect server response time.
How to Improve PageSpeed Performance
After testing your website, review the opportunities and diagnostics instead of making random changes.
- Optimize and properly size images.
- Reduce unnecessary JavaScript.
- Remove unused CSS where practical.
- Minimize unnecessary third-party scripts.
- Improve browser and page caching.
- Reduce excessive network requests.
- Optimize font loading.
- Reduce large page resources.
- Improve server response time.
- Fix layout shifts.
- Reduce long-running JavaScript tasks.
- Review mobile-specific performance problems.
PageSpeed Test for WordPress Websites
WordPress websites can contain many components that affect performance, including themes, plugins, page builders, images, JavaScript, CSS, caching systems, fonts, analytics, and third-party integrations.
A WordPress speed test can help identify areas that deserve further investigation before making optimization changes.
- Too many plugins
- Heavy themes or page builders
- Unoptimized images
- Large CSS and JavaScript files
- Poor caching configuration
- Third-party tracking scripts
- Excessive database or frontend requests
- Slow hosting
- Large or complex pages
Always keep a backup before making significant WordPress performance changes, especially when changing caching, JavaScript, CSS, or plugin settings.
What Are Opportunities and Diagnostics?
Opportunities
Opportunities highlight potential ways to improve page performance. Recommendations may involve image optimization, reducing unused resources, improving resource loading, reducing render-blocking resources, or reducing JavaScript execution.
Diagnostics
Diagnostics provide additional technical information about how the page was loaded and processed. They can help developers and website owners understand resource usage, page structure, and other performance-related conditions.
An opportunity is not necessarily a problem that must be fixed immediately. Always consider the recommendation in the context of your website.
Why Does My PageSpeed Score Change?
PageSpeed results can change between tests. Performance testing can be affected by server response time, network conditions, cached resources, server load, third-party services, dynamic content, and resource availability.
A small difference between individual tests does not necessarily mean that your website suddenly became faster or slower.
When monitoring optimization progress, compare results over time and pay attention to important metrics and recurring issues rather than relying on a single score.
PageSpeed Test vs Real User Performance
A performance audit is useful, but a test result is not exactly the same thing as the experience of every visitor.
Lab-style performance testing uses a controlled testing environment, while real users may access your website using different devices, browsers, networks, locations, and hardware.
This is why performance optimization should consider both technical test results and real-world user experience.
Website Speed Test for SEO
Website performance is one part of creating a good page experience. A technically optimized website can provide a better experience for visitors, but improving PageSpeed does not guarantee higher Google rankings.
Search visibility depends on many factors, including relevance, content quality, search intent, technical accessibility, links, and overall page experience.
Use a website speed test as one part of your broader SEO and website optimization process.
Who Should Use a Website Speed Test?
A PageSpeed Optimization Tester can be useful for:
- Website owners
- WordPress users
- Bloggers
- SEO professionals
- Web developers
- Web designers
- Digital marketers
- Ecommerce store owners
- Freelancers
- Agencies
- Business owners
It can be especially useful when checking a new website, reviewing a redesign, investigating a slow page, or measuring the effect of performance optimization.
How to Test Website Speed
Enter the URL
Enter the full public URL of the webpage you want to analyze.
Start the Test
Run the PageSpeed optimization test and wait for the performance report.
Review the Results
Check mobile and desktop performance, Core Web Vitals, opportunities, diagnostics, and other available audits.
After making appropriate performance improvements, test the same page again to compare the results.
Frequently Asked Questions
What is a PageSpeed Optimization Tester?
How can I test my website speed?
Can I test both mobile and desktop performance?
What is a good PageSpeed score?
What are Core Web Vitals?
What does LCP mean?
What does INP mean?
What does CLS mean?
Why is my mobile PageSpeed score lower than desktop?
Why does my PageSpeed score change between tests?
Does PageSpeed score affect Google rankings?
Does a 100 PageSpeed score guarantee better rankings?
Can I use this tool to check a WordPress website?
Why is my website slow even when the PageSpeed score is high?
Should I try to get a perfect PageSpeed score?
Test Your Website Performance
Use the PageSpeed Optimization Tester above to analyze your webpage and identify performance areas that may need attention.
Test both mobile and desktop performance, review Core Web Vitals, investigate opportunities and diagnostics, and use the results to guide your website optimization work.
A faster, more responsive, and visually stable website can provide a better experience for your visitors.