- Basic Performance Metrics
- Single Location Test
- Desktop Device Only
- Limited Insights
Up and running in 3 steps
1
Add your site
Give it a name and enter the domains it runs on, for example shop.example.com.
2
Paste one script tag
Copy the tag into the <head> of your pages, or send it to whoever runs your site.
3
See your first numbers
Numbers appear within a few minutes of the first visits.
What the snippet looks like
<script async src="https://speed.loadfocus.com/rum.v2.js" integrity="sha384-..." crossorigin="anonymous" data-site="YOUR_SITE_KEY"></script>This is an example. Your real snippet, with your site key filled in, appears on your site's page right after you add the site, ready to copy or forward to your developer.
Works on any site where you can add a script to the <head>: WordPress, Shopify, Webflow or hand-built.
Is my site fast?
Google's Core Web Vitals are three numbers that tell you whether a page feels fast: how it loads, how it responds and whether it stays still. Next to them you see First Contentful Paint (FCP, when anything first appears) and Time to First Byte (TTFB, how soon your server starts sending the page). FCP and TTFB are not Core Web Vitals, but all five numbers are coloured on Google's thresholds, so you see at a glance whether each is good, needs improvement or poor.
Loading
How fast the main content of a page appears. Google calls this Largest Contentful Paint (LCP).
Responsiveness
How fast the page reacts when someone clicks, taps or types: Interaction to Next Paint (INP).
Visual stability
Whether things jump around while the page loads: Cumulative Layout Shift (CLS).
Where is it slow?
Your real pages
Your most viewed pages with their views and speed, so you know which ones to fix first.
Mobile and Desktop
See how the same pages do on Mobile and on Desktop, side by side.
Country, browser and connection
Break the numbers down by country, browser, connection type and how the page was opened, over the last 7, 28 or 90 days.
Why is it slow, and what do I tell my developer?
What slows the page
The four phases of loading the main content, the element and the image behind it, and the element that moves when things jump around.
What slows clicks
The slowest interactions and, in Chrome and Edge, the scripts running during them.
Copy for AI
One click copies the period's report as text, ready to paste into an AI assistant or a message to your developer.
Tell me when it gets worse
Alerts on your limits
Pick a metric and a limit. When its p75 (the 75th percentile: the value three out of four page views are at or under) goes above it, you get a message, and another when it is back under. Up to 5 alerts per site.
Where alerts go
Email, Slack, Microsoft Teams or a webhook, plus Discord, PagerDuty and Opsgenie on paid plans.
Deploy markers
Post a release marker with one API call from your CI or deploy script, and see each release on the trend chart.
Private by design
No cookies
The script sets none and stores nothing in the visitor's browser, and there are no visitor IDs. IP addresses are never stored, and there is nothing to add to your cookie banner.
Bots filtered out
Bots, crawlers, headless browsers, lab tools such as Lighthouse, PageSpeed, GTmetrix and Pingdom, and visits from AWS, Google Cloud and Azure servers are left out of your numbers.
Light on your page
The script is about 3 KB gzipped, loads async so it never blocks the page from rendering, and sends one small beacon per page view.
Real visitors and scheduled tests
Real user monitoring shows what your visitors actually experienced. Page Speed Monitoring runs scheduled Lighthouse checks on the pages you choose, hourly, daily or weekly, from up to 25 cloud regions, including pages behind a login, with recommendations on what to improve.
Plans
Free
1 site, 10,000 page views a month, no credit card.
Paid Page Speed plans
20 sites, 1,000,000 page views a month.
Real user monitoring FAQ
Will it slow my site down?
The script is about 3 KB gzipped, loads async and never blocks your page from rendering. It sends one small beacon per page view.
Do I need a developer?
Not if you can add a script to the <head> of your pages, as you can on WordPress, Shopify, Webflow or a hand-built site. If someone else runs your site, send them the snippet from your site's page, or the setup guide.
Does it use cookies? Do I need to update my cookie banner?
No. The script sets no cookies, stores nothing in the visitor's browser and uses no visitor IDs, and IP addresses are never stored. There is nothing to add to your cookie banner.
How is it different from Google PageSpeed Insights or the Chrome UX Report?
PageSpeed Insights runs a one-off lab test of one URL and, where Google has enough Chrome traffic for it, shows Chrome UX Report field data: a 28-day rolling summary from Chrome users only, for one URL or a whole site. Real user monitoring measures page views on your own pages from the first day, whatever your traffic, shows them day by day, and shows the cause behind slow pages.
What happens when I reach my monthly page views?
Measuring does not stop. Until the next month, 1 in 10 page views is still measured and counted as 10. Paid Page Speed plans include 20 sites and 1,000,000 page views a month.
Does it work with single-page apps?
It counts one page view per page load. Route changes inside a single-page app are not counted as separate page views. You can name your pages yourself by setting window.LOADFOCUS_RUM_PAGE.
Start with
Real User Monitoring
See how fast your site is for the people who visit it, page by page.
Further reading
In-depth guides on the same topic from the LoadFocus blog.