Test Core Web Vitals

Page experience is a ranking factor

Check Core Web Vitals for free

Our free Core Web Vitals checker lets you find out how Google is rating your website and what you can do to optimize it.

Lab and field data

Google collects field data from real Chrome users and uses that information for rankings. But numbers aren't enough to speed up your website, so we also run a detailed performance test in a controlled lab environment.

What is the Chrome User Experience Report?

Google collects performance metrics from Chrome users and publishes those statistics in the CrUX report.

Data aggregation

CrUX data is aggregated across the past 28 days. So if you make a change to your website it will take a few weeks to see the full impact in the Google metrics.

Interaction to Next Paint

See whether your website responds quickly to user input or whether visitors face rendering delays.

Testing Core Web Vitals

Our web vitals testing tool reports both real user data collected by Google as well as in-depth custom lab test results.

Web vitals recommendations

Want to improve Core Web Vitals? We provide a detailed analysis of each metric and a list of opportunities to make your website faster.

What are Largest Contentful Paint subparts?

To display the main page content the page goes through different loading phases. Subparts data shows you how long each phase takes, letting you know where to optimize.

View Core Web Vitals subparts data from Google

Google has started to publish subparts data as part of the Chrome User Experience Report. You can find these metrics in the Web Vitals tab of your test result.

Continuously track Core Web Vitals

Stay on top of your site speed and optimize over time.

Get alerted to regressions

Find out about issues before they impact rankings. DebugBear can send notifications in Slack, Microsoft Teams or by email.

Find the fastest site in your industry

Track Core Web Vitals for competitor websites and rank them by visitor experience.

See industry trends

Check historical CrUX metrics to see how your website and competitors are changing over time.

Check mobile and desktop data

Break data down by device form factor to see how websites performa in different environments.

Set up real user monitoring (RUM)

Check how fast your website is for actual visitors, find out what pages are slow, and identify visitor segments with a poor experience.

Fix slow user interactions

DebugBear provides in-depth debug data to help you fix poor Interaction to Next Paint scores. See what elements cause slow interactions and what scripts are taking a long time to run.