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Free Website Speed Test — Core Web Vitals

Real Google PageSpeed Insights data. Performance score, LCP, CLS, FCP and the top opportunities to speed up your site for SEO and conversions.

How it works

How the website speed test works

The website speed test runs your URL through Google PageSpeed Insights — the same Lighthouse engine Google uses to evaluate Core Web Vitals for ranking. Within 30 seconds you get a numeric performance score out of 100, the three Core Web Vitals (LCP, CLS, INP), supporting metrics like First Contentful Paint and Total Blocking Time, and a prioritised list of the biggest opportunities to speed up your site.

Test before launching, after every major change, and on each key landing page. Mobile is the default because that's how Google ranks — and where most of your users actually browse.

Core Web Vitals

The three Core Web Vitals we measure

LCP

Largest Contentful Paint

Loading speed. The time until the largest content element (usually a hero image or H1) finishes rendering.

Good: under 2.5s · Poor: over 4s

CLS

Cumulative Layout Shift

Visual stability. How much your layout jumps around as the page loads — usually caused by images without dimensions or late-loading fonts.

Good: under 0.1 · Poor: over 0.25

INP

Interaction to Next Paint

Responsiveness. The delay between a user tap or click and the page actually responding — driven by JavaScript execution time.

Good: under 200ms · Poor: over 500ms

Why it matters

Why website speed matters for SEO

Google has been explicit since 2021: Core Web Vitals are a ranking factor. Two sites with identical content and similar backlink profiles will rank in the order of their CWV scores. Slow pages get demoted, fast pages get promoted — and the gap widens on mobile, where most queries happen.

Beyond SEO, speed is a conversion multiplier: every 1-second delay reduces conversions by roughly 7%, bounce rates by mobile users climb 32% when load time goes from 1 to 3 seconds, and 53% of mobile visitors abandon a page that takes more than 3 seconds to load.

After the test

How to improve your website speed

Tackle the highest-impact opportunities first: serve images in next-gen formats (WebP, AVIF), set explicit width and height attributes on every image to stop layout shift, defer non-critical JavaScript, enable browser caching and Brotli compression, and use a CDN. These six wins usually move a mid-range PageSpeed score from 60s to 80s.

For deeper work — render-blocking resources, third-party scripts, server response time — you'll need a developer or a senior web team. Book a free 30-minute Core Web Vitals review and we'll walk through the highest-leverage fixes for your specific site.

FAQ

Frequently asked questions

A website speed test measures how fast your pages load and how stable they feel to users, using metrics like Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS) and First Contentful Paint (FCP). Google uses these signals — collectively called Core Web Vitals — as a ranking factor, so a slow site loses both users and search visibility.

Yes — fully free, no credit card. The tool uses Google PageSpeed Insights under the hood (the same engine as Lighthouse) so the numbers you see are the same ones Google uses to rank pages.

Core Web Vitals are three measurable user-experience metrics Google treats as ranking signals: Largest Contentful Paint (loading speed, target under 2.5s), Cumulative Layout Shift (visual stability, target under 0.1), and Interaction to Next Paint (responsiveness, target under 200ms). The website speed test reports all three.

A PageSpeed score of 90+ on mobile is excellent, 50–89 is OK with opportunities, below 50 is poor and likely costing you traffic and conversions. Mobile scores are almost always lower than desktop — Google ranks on mobile, so optimise there first.

Two reasons. First, Core Web Vitals are explicit Google ranking signals — slow pages rank lower than fast ones, all else equal. Second, every second of load time loses 7–10% of conversions, so even if you rank, slow pages monetise worse than fast ones.

In order of impact: compress and serve modern image formats (WebP, AVIF), eliminate render-blocking JavaScript, set explicit width and height on images to stop layout shift, use a CDN, enable browser caching, and switch to a faster host. The speed test report flags which of these will save the most time on your site.

Mobile testing uses a simulated mid-range phone on a 4G connection. Desktop testing uses a fast cable connection on powerful hardware. The mobile score tells you the truth — most of your users are on phones, on flaky networks, on older devices.