Page Speed Checker

Test your website speed and Core Web Vitals for mobile and desktop. Powered by Google PageSpeed Insights, the same tool Google uses to measure ranking signals.

Why use our Page Speed Checker

Uses the same Lighthouse engine and Core Web Vitals data Google itself uses for ranking, not a third-party approximation.

Free Core Web Vitals checker

Check LCP, CLS, and TBT online with no signup, unlike GSC-integrated tools that require verifying site ownership first.

Mobile and desktop scores together

See both scores side by side since Google indexes mobile-first, a strong desktop score alone can hide a ranking-hurting mobile problem.

Actionable fix opportunities included

Get a ranked list of exactly what's slowing the page down, not just a number, so you know what to fix first for the biggest speed gain.

Website URL *

What Core Web Vitals mean for your ranking

LCP under 2.5s: Largest Contentful Paint measures how fast your main content loads. Google wants it under 2.5s, above 4s is a ranking penalty.

CLS under 0.1: Cumulative Layout Shift measures visual stability. Pages that jump around as they load frustrate users and get penalised.

TBT under 200ms: Total Blocking Time reflects interactivity. High TBT means JavaScript is blocking the main thread, your page feels frozen.

Mobile score matters more: Google indexes the mobile version of your site first. A desktop score of 95 doesn't help if mobile is 40.

Real Page Speed Checker example: before vs. after

A real e-commerce product page's mobile score, before and after fixing the top opportunities this tool flagged.

Before · Unoptimized

Mobile score

6.8s

LCP

A 4.2MB hero image and render-blocking JavaScript pushed LCP well past Google's 2.5s threshold, a clear ranking disadvantage.

After · Optimized

Mobile score

1.9s

LCP

Compressing the hero image to WebP and deferring non-critical JavaScript brought LCP under 2s and the score into the 'Good' range.

Frequently Asked Questions

Does page speed affect SEO rankings?

Yes. Google uses Core Web Vitals (LCP, CLS, INP) as ranking signals since 2021. Pages with poor CWV scores are at a disadvantage vs. equivalent content on faster pages.

What's a good PageSpeed score?

90–100 is good, 50–89 needs improvement, 0–49 is poor. Aim for 90+ on desktop and 70+ on mobile. Mobile is harder due to slower connections and devices.

Why is my mobile score so much lower?

Mobile scores are assessed on a simulated 4G connection with a mid-tier device. Large images, render-blocking scripts, and unoptimised fonts hit mobile much harder than desktop.

How do I fix a slow LCP?

Preload your hero image, use a CDN, switch to WebP format, and ensure your server response time (TTFB) is under 200ms. LCP is almost always caused by large images or slow servers.