Website performance monitoring with Core Web Vitals
SREmonitor measures your website's Core Web Vitals (Largest Contentful Paint, Interaction to Next Paint and Cumulative Layout Shift), plus First Contentful Paint and Time to First Byte, in a real browser on a schedule, and turns them into a single 0 to 100 performance score with history. It sits in one dashboard alongside uptime monitoring and GDPR compliance checks, for businesses and agencies.
Start monitoring free →What website performance monitoring is
Performance monitoring tracks how fast your pages feel to a visitor, not just whether they respond. A page can return a successful response and still take seconds to show anything useful, which hurts conversions and can affect search visibility.
Core Web Vitals are the standard set of user-experience metrics Google publishes. Tracking them on a schedule, rather than testing once when you launch, shows you when a plugin, image or script change quietly makes the site slower.
What SREmonitor measures
- LCP (Largest Contentful Paint): how long the main content takes to appear.
- INP (Interaction to Next Paint): how quickly the page responds when someone interacts with it.
- CLS (Cumulative Layout Shift): how much the layout jumps around while loading.
- FCP and TTFB: First Contentful Paint and Time to First Byte, which help separate a slow server from slow front-end code.
- Performance score: the metrics combined into a single 0 to 100 score you can track over time and alert on.
Measured in a real browser
Measurements come from loading your page in a real browser, so JavaScript runs and the page renders as a visitor would see it. Results are stored as history, so you can see a regression appear after a specific change instead of guessing.
You can set a target and a warning level for the performance score and be alerted when it drops below them.
Why it belongs next to uptime and compliance
Slow pages, outages and privacy gaps are all things a visitor or regulator notices before you do. Seeing them on one dashboard means one place to look and one set of alerts, which suits a small team with no dedicated operations person.
Who it is for
- Site owners who depend on organic search or paid traffic and cannot afford a slow page.
- Agencies that want to catch a client site regressing after an update.
- Teams that need a simple, regular performance reading without running their own test infrastructure.
What it does not do
Being clear about limits matters more than a longer feature list.
- Results are lab measurements from a real browser under controlled conditions. They are not field data collected from your real visitors, so they can differ from what Google reports for your site.
- Measurements run from the UK, not from a spread of global locations or device types.
- It reports where performance stands and when it changes. It does not automatically fix the slow pages it finds.
Pricing
Free: £0.00 per month. Monitor up to 3 endpoints, 3 days of history and 3 compliance scans per month.
Pro: £23.99 per month (launch price, normally £29.99). Monitor up to 20 endpoints, 3 months of history, unlimited compliance scans, PDF reports and monthly automatic re-scans.
White-label add-on for agencies: £19.00 per month on top of Pro, to put your own name and logo on alert emails and PDF compliance reports. See the full pricing page.
Frequently asked questions
What are Core Web Vitals?
Core Web Vitals are Google's user-experience metrics: Largest Contentful Paint for loading, Interaction to Next Paint for responsiveness, and Cumulative Layout Shift for visual stability.
Which performance metrics does SREmonitor track?
LCP, INP, CLS, First Contentful Paint and Time to First Byte, combined into a 0 to 100 performance score with history.
Is this the same data Google shows in Search Console?
No. SREmonitor takes scheduled lab measurements in a real browser. Google's Core Web Vitals report uses field data from real Chrome users, so the numbers can differ.
Can I get alerted when performance drops?
Yes. You can set a target and warning level for the performance score and receive alerts by email or webhook when it falls below them.
Is website performance monitoring free?
The Free plan monitors up to 3 endpoints with 3 days of history. Pro monitors up to 20 endpoints with 3 months of history.