Preparing the rocket for launch

Monitor Your
Core Web Vitals

Get the performance metrics that Google uses to measure your website performance, the Core Web Vitals, in real-time from your real users.

Histogram of First Contentful Paint (FCP) Performance

First & Largest
Contentful Paint Time

Measure the time needed to show content on your page. Know that your pages show content fast and users aren't waiting on loading spinners.

Sloth being pushed around from Layout Shift

Layout Shifts

Does your page jump around as async content loads? Even if it doesn't for you, it might for users on slow networks.

Read more about Cumulative Layout Shifts and how to fix them.
Distribution of First Input Delay (FID) Performance

Input Delay

When your page has too much JavaScript, the browser may not be ready for the user. Get the metrics to know when your pages are feeling sluggish and old.

Learn about First Input Delay.

Core Web Vital FAQ

How is this different from load-time performance?

Page load-time is still an important metric for performance, but it only measures one facet of performance, and its easily manipulated. The Core Web Vitals are a set of metrics that measure specific concepts in how users perceive the performance of your website.

The Core Web Vitals are also more difficult to collectively fabricate, making them useful as a generalizable metric to compare the speed of websites.

Does this affect my SEO?

Yes! Google has stated that your Core Web Vital scores are a factor in your website's page rank. If you are competing for keywords (and who isn't really?) then you need to stay faster than your competitors in your Core Web Vitals.

How do you measure the Core Web Vitals of my website?

The raw metrics are produced by the users' browser and collected by a small JavaScript agent that you include on your website. The agent does the same calculations as Google Lighthouse and similar tools.

The agent sends this metrics to our service, where we enrich and aggregate them so you can see what real users experienced.

Will Request Metrics match my scores in Lighthouse, PageSpeed Insights, or CrUX?

Not exactly, no.

Google Lighthouse and PageSpeed Insights are "dev-time" tests. They measure how fast a robot can load your webpage with some constraints. That's not the same as a real user and may not represent your typical website visitor. These tools are largely for pre-release testing your site.

CrUX, like Request Metrics, is measuring the real user performance. However, CrUX data is usually limited to a whole domain, and only published monthly. Request Metrics data is realtime, and likely includes many more data points than CrUX.

Where can I learn more about this?

We wrote an exhaustive guide on measuring web performance with the Core Web Vitals. It includes everything you need to know to monitor and understand these important values.