Run a website speed test, and make every page fast on a phone.
A website speed test built on Google's own checks. Test any page on mobile and desktop, see its Core Web Vitals explained in plain English, and get the few fixes that make the biggest difference.
Included in the Solo and Agency plans. See pricing
What Core Web Vitals does
What the page speed checker measures
The same measurements Google uses, from Google's PageSpeed test, for each page you check.
What a website speed test tells you, and what to do about it
A website speed test gives you a lot of numbers. The point is not the numbers themselves but what they mean for the people using your site, and which few changes will make the biggest difference.
Why page speed matters
Most visitors arrive on a phone, often on a slower connection than your office broadband. When a page shows something useful quickly, more of them stay, read and get in touch.
Speed matters to Google too. Core Web Vitals are one of the signals Google uses when it ranks pages, so a faster site can win you more visits from search as well as more enquiries from the visitors you already have.
The three measurements to watch
Largest Contentful Paint is how long the biggest thing on screen, usually the main photo or headline, takes to appear. Under 2.5 seconds is good. Cumulative Layout Shift is how much the page jumps about while it loads; under 0.1 is good. Total Blocking Time is how long the page is too busy running code to respond to a tap.
Vantage explains each one in plain English next to its result, so you can see which will speed the page up most.
Why the mobile score is usually lower
The mobile test simulates a mid-range phone on a slower connection, which is closer to how many people really browse. Desktop scores are almost always higher. Fix for mobile first: it's the score more of your visitors experience.
The fixes that usually help most
Smaller images are the most common way to speed a page up. Resizing photos to the size they're shown at, and using modern image formats, often saves seconds on its own. Give images their width and height so the page doesn't jump as they load, and don't delay loading the main image at the top of the page.
After that, look at code: chat widgets, trackers and plugins you no longer use all add weight. Vantage lists Google's Lighthouse suggestions in order of the time each one saves, so you know where to start.
Which pages to test
Test your homepage, your main service or product pages, and any page your ads send people to. Test again after any change to the site, such as new photos, a new plugin or a redesign, so a slow-down never goes unnoticed. For a wider look at what stops visitors getting in touch, run the Website Auditor.
Three steps
Enter any page address.
Run the speed test for mobile and desktop.
Start with the fixes that save the most time, then test again.
No AI credits: it uses Google's free speed checks.
Everything connects
Common questions about our website speed test
What is a website speed test?
A test of how fast a page loads and becomes usable. Vantage's runs Google's own PageSpeed test on mobile and desktop and explains the results in plain English, with the fixes in order.
Is a site speed test the same as a page speed checker?
Yes, they are different names for the same test. Each one checks a single page, so test your most important pages, such as the homepage and the pages your ads send people to.
What are Core Web Vitals?
Google's measures of how a page feels to use: how fast the main content appears, how much the layout jumps about, and how quickly it responds. Google uses them as one of its ranking signals.
Why is my mobile score lower than desktop?
The mobile test simulates a mid-range phone on a slower connection, which is how many visitors really browse. Fix for mobile first: it is usually the lower score and the one more people see.
How often should I run a website speed test?
After any change to the site, such as new photos, a new plugin or a redesign, and before you launch an ad campaign. It is the quickest way to catch a page that has slowed down.
Does the speed test use AI credits?
No. It uses Google's free speed checks, so you can run a web speed test as often as you like on any plan.
See Core Web Vitals on your own business
Vantage is in open beta. Join for £5 and get every tool with 100 AI credits. Access ends when the beta closes.