Website Speed Test
Test your website speed with Google PageSpeed Insights. Get Lighthouse performance scores, Core Web Vitals (LCP, CLS, FCP), and prioritized recommendations to improve page speed.
This may take 10–30 seconds while Google PageSpeed Insights analyzes your site.
How to Use the Website Speed Test
Enter any URL in the field above and click Run Test. Choose Mobile or Desktop before running — Google evaluates these separately. The test connects to the Google PageSpeed Insights API and typically takes 10–30 seconds.
Your results include four Lighthouse category scores (Performance, Accessibility, Best Practices, SEO), a full Core Web Vitals breakdown, and a list of the top opportunities to reduce load time.
Understanding Core Web Vitals Thresholds
| Metric | Good | Needs Improvement | Poor |
|---|---|---|---|
| LCP — Largest Contentful Paint | ≤ 2.5s | 2.5s – 4.0s | > 4.0s |
| CLS — Cumulative Layout Shift | ≤ 0.1 | 0.1 – 0.25 | > 0.25 |
| FID / INP — Interaction | ≤ 100ms | 100ms – 300ms | > 300ms |
| FCP — First Contentful Paint | ≤ 1.8s | 1.8s – 3.0s | > 3.0s |
| TTFB — Time to First Byte | ≤ 800ms | 800ms – 1.8s | > 1.8s |
Why Page Speed Matters for SEO
Google has used page speed as a ranking factor for desktop since 2010 and for mobile since 2018. In 2021, the Page Experience update made Core Web Vitals an official ranking signal. Faster sites also tend to have lower bounce rates — research shows a page that loads in 1 second has a 3× lower bounce rate than one that loads in 5 seconds.
What the Lighthouse Scores Measure
Performance
A weighted aggregate of loading speed metrics. Heavily influences Core Web Vitals. Aim for 90+.
Accessibility
Checks for ARIA labels, color contrast, keyboard navigation, and more. A score below 90 indicates usability issues.
Best Practices
Covers HTTPS usage, console errors, deprecated APIs, and browser compatibility.
SEO
Verifies crawlability signals: meta description, viewport tag, robots directives, and structured data.
Frequently Asked Questions
What is Google PageSpeed Insights?
Google PageSpeed Insights (PSI) is a free tool by Google that reports on the user experience of a page on both mobile and desktop devices, providing suggestions on how to improve that page. It uses the Lighthouse auditing engine and also incorporates real-world Chrome User Experience Report (CrUX) data.
What are Core Web Vitals and why do they matter for SEO?
Core Web Vitals are a set of real-world, user-centered metrics that quantify key aspects of the user experience: loading performance (LCP), visual stability (CLS), and interactivity (FID/INP). Google uses Core Web Vitals as a ranking signal in its Page Experience update. Sites that meet the 'Good' threshold for all three metrics may receive a boost in search rankings.
What is a good PageSpeed performance score?
Google classifies scores as: 90–100 (Good, shown in green), 50–89 (Needs Improvement, shown in amber/orange), and 0–49 (Poor, shown in red). A performance score of 90 or above is generally considered excellent. Most competitive websites aim for 80+ on mobile and 90+ on desktop.
Why is the mobile score usually lower than desktop?
Lighthouse simulates a mid-tier mobile device with a throttled CPU and network (equivalent to a 4G connection) when running mobile tests. This is intentional — it represents the real-world conditions of a large portion of mobile users. Desktop tests use no CPU or network throttling, which is why desktop scores are typically 10–30 points higher.
How often should I run a website speed test?
Run a speed test after every significant website change: after deploying new code, installing plugins or third-party scripts, changing your CDN or hosting, or adding new images and media. For active websites, a monthly speed audit is a good practice. Set up performance budgets in your CI/CD pipeline to catch regressions automatically.
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