Free Page Speed & Core Web Vitals Checker

What Is the Free Page Speed Checker?

The Page Speed Checker is a free tool that analyzes how fast any webpage loads and how well it follows modern web performance, accessibility, and SEO best practices. It runs on top of Google's own PageSpeed Insights engine, the same technology behind Google Search Console's Core Web Vitals reports, so the scores and recommendations you see here reflect exactly how Google itself evaluates your page.

Instead of digging through Google's own interface or command-line tools, you simply paste a URL, choose whether to test the mobile or desktop experience, and get four clear scores — Performance, Accessibility, Best Practices, and SEO — along with the specific technical issues slowing your page down and how much time fixing each one could save.

Why Page Speed Matters

Page speed directly affects three things website owners care about: search rankings, user experience, and revenue. Google has confirmed that Core Web Vitals — a set of speed and stability metrics — are a ranking factor, meaning a slow page can rank lower than a faster competitor with similar content. Beyond SEO, visitors are simply less patient with slow sites: studies from Google and major retailers have repeatedly shown that load-time delays of even one or two seconds measurably increase the percentage of visitors who leave before the page finishes loading, directly impacting conversions and ad revenue for content sites alike.

How This Tool Works

Enter the URL of the page you want to test — it can be your homepage or any specific page on your site.
Choose Mobile or Desktop. Google evaluates these separately since real-world mobile connections and devices are typically slower, and mobile is usually the stricter test.
Click "Check Page Speed." The tool sends your request to Google's PageSpeed Insights engine, which actually loads and measures your page in a real browser environment.
Review your results — four category scores, key loading metrics, and a prioritized list of the improvements that will save the most time.

Understanding the Key Metrics

First Contentful Paint (FCP) measures how long it takes for the first piece of content — text or an image — to appear on screen after a visitor lands on your page. A fast FCP reassures visitors that the page is actually loading.

Largest Contentful Paint (LCP) measures when the largest visible element, usually a hero image or main heading, finishes rendering. This is one of Google's official Core Web Vitals and is widely considered the clearest signal of perceived load speed.

Total Blocking Time (TBT) measures how long the page's main thread is too busy running scripts to respond to clicks, taps, or keyboard input. High TBT often means a page looks loaded but feels unresponsive or "janky" when a visitor tries to interact with it.

Cumulative Layout Shift (CLS) measures unexpected visual movement — for example, text jumping down the page because an image or ad loaded late and pushed content around. This is a Core Web Vital because it directly causes frustrating misclicks.

Speed Index summarizes how quickly the page's content is visually displayed overall, giving a general sense of perceived loading speed beyond any single moment.

Common Causes of a Slow Page

Most performance problems trace back to a handful of recurring causes. Unoptimized images are the most frequent culprit — a photo straight from a camera or phone can be many times larger than what a browser actually needs to display it at its rendered size. Render-blocking resources, such as stylesheets and scripts loaded before any visible content, delay the moment a visitor sees anything at all. Excessive third-party scripts — analytics tags, chat widgets, advertising code, and social embeds — each add their own network requests and processing time, and their combined weight is often underestimated. Lack of caching and compression means repeat visitors download the same files over and over instead of reusing what their browser already has. Finally, server response time itself matters: if the hosting environment is slow to generate the page in the first place, no amount of front-end optimization can fully compensate. This tool's opportunity list is built to point directly at whichever of these is affecting the specific page you tested, rather than offering generic advice that may not apply.

Tips for Improving Your Score

Always test both mobile and desktop — they often produce very different scores, and mobile usually needs more attention since it represents the majority of web traffic globally.
Focus on the opportunities with the highest potential time savings first rather than trying to fix everything at once.
Compress and properly size images before uploading them, since oversized images are one of the most common causes of slow Largest Contentful Paint.
Limit the number of render-blocking scripts and stylesheets loaded before the visible content of the page.
Audit third-party embeds periodically — chat widgets, ad networks, and tracking scripts tend to accumulate over time and are easy to forget once installed.
Re-test after every change — performance work is incremental, and confirming each fix actually helped avoids wasted effort.

Frequently Asked Questions

Is this Page Speed Checker free to use?

Yes, completely free, with no account or sign-up required, and you can test as many URLs as you like.

Why do my mobile and desktop scores differ so much?

Google tests mobile using a simulated mid-range device on a throttled connection to reflect real-world conditions, while desktop assumes a faster machine and connection. It's normal and expected for mobile scores to be noticeably lower.

My score is low — does that mean my site is broken?

No. A lower score simply highlights room for improvement, not that the site is broken or unusable. Many fully functional, popular websites still score moderately on performance while working perfectly fine for visitors.

How often should I re-check my page speed?

It's good practice to re-check after any major update to your site — a new theme, added plugins or scripts, new images, or significant content changes — as well as periodically every few months to catch any gradual slowdown.