What is a Website Speed Test?
A website speed test measures how a page loads, responds and becomes usable under a defined browser strategy. It helps reveal delays that visitors may experience.
PerformanceX AI
PerformanceX AI helps you analyze and improve website performance with AI-powered insights. Test page speed, Free website speed test,Core Web Vitals, SEO, accessibility, best practices, and security using Google Lighthouse data. Discover optimization tips, performance guides, and practical solutions to build faster, more user-friendly websites.
Independent performance intelligence
Test Your Website Speed Instantly
Analyze Performance, Accessibility, Best Practices and SEO with a powerful Lighthouse-based website analyzer.
- Real API data
- Mobile and desktop
- No account required
Performance signalLive analysis
PXReady to measure
Performance signalReady
Accessibility signalReady
Best-practice signalReady
SEO signalReady
Start a speed test
Enter a public webpage URL to generate a real performance report.
Analyzing your website
Connecting to Lighthouse...
Unable to analyze this website
Analysis complete
Performance Report
Analyzed URL:
Not available
Device:
Mobile · Analysis date:
Not available
Test strategyMobile
Report statusReady to review
Analysis sourceLighthouse data
Core Web Vitals
Key lab metrics that describe the experience of your page.
Performance Metrics
Detailed values returned by the Lighthouse analysis.
| Metric | Value | Status | Explanation |
|---|
Real User Experience
Field data availability depends on the analyzed URL and available Chrome UX data.
Performance Opportunities
Actionable recommendations derived from Lighthouse audits.
Diagnostics
Expandable Lighthouse diagnostic audits.
Passed Audits
Successful checks from this analysis.
Failed Audits
Issues and suggested fixes from Lighthouse.
SEO Analysis
Search-readiness checks from the real Lighthouse response.
Accessibility
Inclusive experience checks for your page.
Best Practices
Security, compatibility and modern web checks.
Performance fundamentals
Make every visit count
Speed testing turns complex browser signals into practical context for your next improvement.
Why Performance Matters
Faster experiences can support usability, Core Web Vitals, mobile visitors, search visibility and conversions. Results vary by page, audience and conditions.
What PerformanceX AI Checks
Performance, Accessibility, Best Practices, SEO, Core Web Vitals and Lighthouse audits are shown when the API returns them.
Practical next steps
How to improve website speed
Use the report as a starting point. The right fix depends on your page, stack and audience.
Reduce page weight
Optimize images, remove unused resources, optimize fonts and reduce third-party scripts where practical.
Improve delivery
Review server response time, caching, compression, CDN configuration and the order in which critical resources load.
Measure again
Apply a focused change, test the same strategy again and compare real returned data rather than relying on assumptions.
Questions
Frequently asked questions
What is PerformanceX AI?
PerformanceX AI is an independent website performance analysis tool that uses Google's PageSpeed Insights API and Lighthouse data.
Is PerformanceX AI free?
The analyzer is available without a user account. Availability is subject to the underlying API quota.
How does the website speed test work?
Enter a public webpage URL, choose Mobile or Desktop, and PerformanceX AI requests a Lighthouse analysis from Google's PageSpeed Insights API.
What is a good PageSpeed score?
A score from 90 to 100 is classified as Excellent here; 50 to 89 needs improvement, while 0 to 49 is poor.
What are Core Web Vitals?
Core Web Vitals are user-experience metrics such as Largest Contentful Paint, Interaction to Next Paint and Cumulative Layout Shift.
What is the difference between mobile and desktop testing?
The two strategies run Lighthouse with different device and network conditions, so the results can differ.
Why can PageSpeed results change between tests?
Lab results can vary with network conditions, server response time, page changes and third-party resources.
Why is field data unavailable for some websites?
Real-user field data depends on whether enough Chrome UX Report data exists for the analyzed URL or origin.
Does PerformanceX AI store my website URL?
Recent test history is stored locally in your browser when enabled. The entered URL is sent to the PageSpeed Insights API for analysis.
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