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PerformanceJune 22, 2026· 9 min read

Free Page Speed Checker: How to Test Your Website Speed & Core Web Vitals

Page speed is a direct Google ranking factor. A slow website doesn't just frustrate visitors — it actively ranks lower than a faster competitor with identical content.

Why page speed matters for SEO

Google has used page speed as a ranking factor since 2010 for desktop and since 2018 for mobile. In 2021, it went further — introducing the Page Experience update which made Core Web Vitals explicit ranking signals. Today, a slow page is a page that ranks lower, regardless of how good the content is.

But speed doesn't just affect rankings. It affects every conversion metric on your site:

53%

of mobile users leave a page that takes more than 3 seconds to load

1s

delay in load time reduces conversions by up to 7%

100ms

faster load time increases Amazon's revenue by 1%

A free page speed checker gives you your exact score and tells you precisely what's causing slowness — so you can fix the right things instead of guessing.

Core Web Vitals explained

Core Web Vitals are the three speed metrics Google officially uses as ranking signals. A page speed checker tests all three:

LCP — Largest Contentful Paint

✓ Good: Under 2.5s~ Needs work: 2.5–4s✗ Poor: Over 4s

How long it takes for the largest visible element on the page (usually the hero image or main heading) to fully load. This is the metric users notice most — it's when the page "feels" ready.

CLS — Cumulative Layout Shift

✓ Good: Under 0.1~ Needs work: 0.1–0.25✗ Poor: Over 0.25

How much the page layout shifts unexpectedly as it loads — images popping in and pushing text down, buttons moving before you click them. A high CLS causes accidental clicks and frustrated users.

INP — Interaction to Next Paint

✓ Good: Under 200ms~ Needs work: 200–500ms✗ Poor: Over 500ms

How quickly the page responds when a user clicks, taps, or types. Replaced FID (First Input Delay) in March 2024. A slow INP makes your site feel laggy and unresponsive.

How to use the free page speed checker

1

Enter your page URL

Paste any URL — your homepage, a key landing page, or your slowest-feeling page. You can test any publicly accessible URL.

2

Get your speed scores

SEO-Snap runs Lighthouse tests for both mobile and desktop, returning your PageSpeed score (0–100) and all three Core Web Vital metrics.

3

Review what's slow

You'll see a prioritised list of issues — render-blocking scripts, unoptimised images, unused CSS, slow server response — with each issue's impact on your score.

4

Fix highest-impact issues first

Focus on the top 2–3 issues. A single large unoptimised image often accounts for half your LCP score. Fix the big things first before micro-optimising.

Free Website Speed Test

Check your PageSpeed score and Core Web Vitals on mobile and desktop — free, instant, no signup.

Test Page Speed Free →

The most common page speed problems (and how to fix them)

Unoptimised images

Impact: Very High

Fix: Convert images to WebP format (30–50% smaller than JPEG). Use correct dimensions — don't serve a 3000px image displayed at 800px. Use lazy loading for below-fold images.

Render-blocking JavaScript

Impact: High

Fix: Add defer or async to non-critical script tags. Move scripts to the bottom of the body. Use dynamic imports for JavaScript that isn't needed on initial page load.

No browser caching

Impact: High

Fix: Set long cache-control headers for static assets (images, CSS, JS). Use a CDN to serve cached versions from servers close to your users.

Slow server response time (TTFB)

Impact: High

Fix: Use a faster hosting provider or upgrade your plan. Enable server-side caching. Move to a CDN. TTFB should be under 200ms — anything over 600ms is a serious problem.

Large CSS files

Impact: Medium

Fix: Remove unused CSS (tools like PurgeCSS help). Minify CSS files. Consider critical CSS inlining to load above-fold styles immediately.

No CDN

Impact: Medium

Fix: A CDN (Cloudflare, Fastly) serves your assets from servers near your users. Free plans are available and can cut load times by 40–60% for international visitors.

Frequently asked questions

What is a good page speed score?▼
A score of 90–100 is excellent, 50–89 needs improvement, and below 50 is poor. Aim for 70+ on mobile and 85+ on desktop. The mobile score matters more because Google uses mobile-first indexing — it ranks your site based on the mobile version.
What are Core Web Vitals?▼
Core Web Vitals are three speed metrics Google uses as ranking signals: LCP (Largest Contentful Paint) measures loading — target under 2.5 seconds. CLS (Cumulative Layout Shift) measures stability — target under 0.1. INP (Interaction to Next Paint) measures responsiveness — target under 200ms.
Why is my mobile speed score lower than desktop?▼
Mobile tests simulate a slower device (mid-range Android) on a 4G connection. Desktop tests simulate faster hardware on broadband. Mobile scores are almost always 20–40 points lower. This is expected — focus on improving your mobile score since that's what Google cares about.
My speed score is good but my site still feels slow — why?▼
Lab scores (from tools like Lighthouse) simulate ideal conditions. Real users experience varied network speeds, device capabilities, and geographic distances from your server. Check your Field Data in Google Search Console for real-user Core Web Vitals.
How often should I test my page speed?▼
Test page speed after any significant site change — new images, new plugins, redesigns, hosting moves. Also check monthly to catch gradual degradation. Sites often slow down over time as more content and plugins are added.

Free Tool

Test your page speed now — free

Get your PageSpeed score and Core Web Vitals on mobile and desktop. Find exactly what's slowing your site down.

Test Page Speed Free →

Works on any public URL · Instant results · No account needed

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