Core Web Vitals & Page Speed Test by StatJolt

Test page speed in one click. See LCP, CLS and INP in plain words, with a fix for each slow result.

Core Web Vitals and page speed test in one click. Open any page. Click the icon. Read the result. No URL to paste. No score without an explanation. What you get: - LCP, INP, CLS, FCP and TTFB, live from your browser - A plain answer: is this page fast or slow? - One clear fix for each slow result - The slowest element and each layout shift, marked on the page - Your own test history for each page - The tracking scripts that load on the page WHY PAGE SPEED MATTERS A slow page loses visitors before they read a word. Google also uses Core Web Vitals as a signal in search. This extension shows you where your page stands in a few seconds. FIVE NUMBERS IN PLAIN WORDS - Main content (LCP): when the biggest item appears. Aim for under 2.5 s. - Click response (INP): how fast the page reacts to a click. Aim for under 200 ms. - Layout jumps (CLS): how much the page jumps while it loads. Aim for under 0.1. - First content (FCP): when the visitor sees the first thing. Aim for under 1.8 s. - Server response (TTFB): how long your server takes to start. Aim for under 800 ms. Each number gets a label: Good, Needs work or Slow. The limits are the same ones Google uses. A FIX FOR EACH SLOW RESULT A red number alone does not help you. So each slow result comes with one fix you can act on. For example: - Slow main content: make the main image smaller and load it first. - Layout jumps: give images, ads and banners a fixed size. - Slow server: turn on page caching or use faster hosting. SEE THE PROBLEM ON THE PAGE Click "Show main content". An orange frame marks the biggest element on the page. This is the element that LCP measures. Click "Show jumps". An orange frame marks each element that moved while the page loaded. TEST PAGES THAT ONLINE TOOLS CANNOT REACH The test runs in your own tab. So it also works on pages behind a login, on a staging site and on localhost. Online test tools see only public pages. TRACK YOUR PROGRESS The extension saves your last 10 tests for each page. Each new test shows your last result next to the new one. So you see at once if your fix worked. SEE WHAT YOUR TRACKING SCRIPTS COST The extension lists the tracking tools that load on the page. Examples are Google Analytics, Meta Pixel, Hotjar and cookie banner tools. It also shows how many kilobytes they add to the page. SHARE THE RESULT One click copies the result as plain text. Paste it into a ticket, an email or a chat with your developer. YOUR DEVICE OR YOUR REAL VISITORS? This test shows one device: yours. Your visitors use other phones, other networks and other countries. Connect a free StatJolt account. Then the extension shows your test next to the real speed of this page and your whole site, from the last 28 days of visits. 3 reasons to try StatJolt: 1. See the real speed of every page, from every visitor. 2. Catch the JavaScript errors that break your pages. 3. No cookies and no cookie banner. Setup takes a minute. StatJolt is €0 to use until 11 April 2027 at any amount of traffic. After that it stays €0 for low-traffic sites. HOW TO USE IT 1. Pin the extension to your toolbar. 2. Open your website. 3. Click the icon and read the result. Tip: click something on the page before you open the test. INP needs a click to measure. PRIVACY No debugger warning. The extension reads only the tab you click on. It asks for no access to all your sites. Your test history stays in your browser. Without a StatJolt account, no test data leaves your browser. With an account, the extension sends only the domain and path of the tested page. It does this to get your real visitor data.