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Core Web Vitals UX score check

  • Largest Contentful Paint

    • 75% of all pageviews is seeing the biggest element within 0.0seconds
    • 0% is still having an experience of above 2.5 seconds;
    • This often is a hero- or productimage, which is a confirmation to the user that they reached what they were looking for
    • If TTFB or FCP are healthy, check your rendering strategy and image attributes (lazyload, fetchpriority)

    Too many visitors clicked away too fast or before any other interaction to allow Google to report a trustworthy number for the LCP metric

  • First Input Delay

    • 25% of all pageviews is experiencing a delay of 00milliseconds or more
    • 0% is still having an experience of above 100ms;
    • The first interaction is an important one. Too much delay right away could scare visitors way
    • This is often caused by long rendering or JavaScript tasks

    There were too few interactions to allow Google to report a trustworthy number for the FID metric.

  • Cumulative Layout Shift

    • 25% of all pageviews is disturbed by a layout shift of 0.0 or more
    • 0% is still having a CLS experience of more than 0.10;
    • Layout shifts are likely to distract users, or frustrate them when they just started interacting
    • This is often caused by incomplete CSS or dynamically injecting new contents

    Too many visitors clicked away too fast or before any other interaction to allow Google to report a trustworthy number for the CLS metric

  • First Contentful Paint

    • 25% are forced to look at a white screen for more than 0.0seconds
    • 0% is still having an experience of above 1.8 seconds;
    • This is an issue as FCP is important for first user engagement + bounce
    • You might want to look at JS (such as A/B testing) or externally hosted files first

    Apparently, Google wasn't able to collect a sufficient amount of FCP data

  • Time to First Byte

    • In 25% of all pageviews, the browser is waiting more than 000ms for a (server) response
    • 0% is still having an experience of above 800ms;
    • If your FCP isn't making up for this, then fixing this will be a shortcut to improved user engagement
    • Investigate waiting-, DNS- and TCP time, server side caching rules and plugins

    Apparently, Google wasn't able to collect a sufficient amount of TTFB data

How is this Core Web Vitals data free?

Our summary report is generated using the publicly available Chrome User Experience Report (CrUX) dataset, which captures real user experiences across millions of websites. The CrUX data is gathered exclusively from Chrome browser users who have opted in, with the exception of iOS users.

We update our data on a daily basis, aggregating information from the previous 28 days.

Why measure my Core Web Vitals?

We've developed a user-friendly tool called the Core Web Vitals Checker that provides valuable insights into your website's performance without requiring any complicated setup or processes.

Our tool uses real Google Chrome browsing data to report four essential site speed metrics. Each metric is designed to measure different aspects of user experience, such as loading time, interactivity, and visual stability.