Analyse My Website Performance
Type in any URL and PerformanceX AI will run a real Google PageSpeed Insights audit on it — for mobile and desktop separately — so you can see your Core Web Vitals, your loading times, and exactly what's slowing your site down.
What "analyse my website performance" actually means
When people search for a website performance checker, they're usually after one of three things: a website speed test that gives them a single score, a deeper site speed audit that explains why a page is slow, or a way to compare mobile website performance against desktop website performance on the same URL. The tool above does all three in one pass — run it once and you'll have a website performance report you can act on immediately, without switching between five different apps.
Website performance testing isn't a vanity exercise. Page speed affects conversion rate, bounce rate, and — because Core Web Vitals are a confirmed Google ranking signal — technical SEO. A website speed report that shows a slow Largest Contentful Paint or a high Cumulative Layout Shift is telling you, in concrete numbers, where visitors are getting frustrated before they ever read your content.
Reading your Core Web Vitals
Core Web Vitals are the three metrics Google uses to judge real-world page experience. Here's what each one tells you and the thresholds Google treats as "good":
| Metric | Measures | Good threshold |
|---|---|---|
| LCP (Largest Contentful Paint) | How long the main content takes to render | ≤ 2.5s |
| INP (Interaction to Next Paint) | How responsive the page feels to clicks/taps | ≤ 200ms |
| CLS (Cumulative Layout Shift) | How much the layout jumps around while loading | ≤ 0.1 |
You'll also see supporting metrics in the results above — First Contentful Paint (FCP), Speed Index, Total Blocking Time (TBT), and server response time (TTFB). These don't carry the same ranking weight as the three Core Web Vitals, but they're often the root cause behind a poor LCP or INP score, so a proper website performance analysis reads all of them together rather than in isolation.
Mobile website performance vs. desktop website performance
These are rarely the same number, and testing only one gives you half the picture. Mobile devices generally have less CPU power and slower, less reliable connections, so a page that scores well on desktop website performance testing can still score poorly on mobile — and since Google primarily uses mobile-first indexing, your mobile score is the one that matters most for search visibility. Run both tests above and compare the scores side by side before deciding what to fix first.
Common causes of poor website loading time
- Unoptimised images — oversized files are still the single most common cause of a slow LCP.
- Render-blocking JavaScript and CSS — scripts that must load before the page can paint.
- Slow server response (high TTFB) — often a hosting or caching problem, not a front-end one.
- No caching or compression — every repeat visit re-downloads assets from scratch.
- Layout shifts from ads, fonts, or embeds — elements that push content around after the initial render, hurting CLS.
- Too many third-party scripts — trackers and widgets that add weight without adding value for the visitor.
From website speed optimization to better rankings
Once you know which metric is weakest, the fix is usually specific rather than general. A poor LCP typically means compressing or lazy-loading images and removing render-blocking resources above the fold. A poor INP usually points to heavy JavaScript execution on interaction. A poor CLS almost always means reserving space for images, ads, and embedded content before they load. Site speed optimization done this way tends to move both the user experience and the technical SEO side of your rankings at the same time, because you're addressing the same underlying causes.
Retesting after you optimise
Site speed monitoring isn't a one-time task — a single deploy, a new plugin, or a heavier hero image can quietly undo a week of optimisation work. After making changes, re-run the analyser above on both mobile and desktop to confirm the fix actually moved the numbers, and keep a rough record of your score over time so regressions are obvious rather than invisible.
Frequently asked questions
Is this a real website speed test, or a demo?
It's real. Every click on "Analyse Website Performance" sends a live request to the Google PageSpeed Insights API and returns that specific URL's actual Lighthouse and field data — nothing on this page is simulated or hard-coded.
Why did my score change on a second test?
Lab-based tests like this one run in a simulated environment that can vary slightly between runs due to network and server conditions. Treat a single score as a strong estimate, and use the underlying metrics (LCP, CLS, TBT) as your primary signal rather than the top-line number alone.
Does a better performance score guarantee higher rankings?
No. Core Web Vitals are one confirmed ranking factor among many, and Google has said page experience mainly acts as a tie-breaker between otherwise similar content. Good performance removes a barrier to ranking well; it doesn't replace the need for relevant, well-structured content.
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