Get developer insights onReal user data

Changing lab data numbers, even without touching any code? We'll give you real UX outcomes of your hard work.

Optimize for real users


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  • 1 %More sales by making our LCP 31% faster

  • 0 %Mobile revenue boost by improving CWV

  • 24 %Visitors will not return after bad mobile experience

  • -1 %Less bounce after focusing on optimization

Free Core Web Vitals check

Check your website's Core Web Vitals and other page speed metrics over the past six months.

  • Don't fall behind

    See the performance impact of the latest deploys

    Done a new deploy? Annotate it and see the impact on website speed within the hour.

    • See what has improved or deteriorated through filters and dimensions
    • Make obtained data actionable

  • Easy as 1, 2, 3

    Find simple and technical pagespeed optimizations

    Whether it's about a lazyloaded image or finding the right caching strategy. Get the right insights that lead to making better decisions.

    • Use 30+ filters and dimensions
    • Know which bit of code or image is problematic for Core Web Vitals

  • Make it part of your workflow

    Work on to-do's and annotate your latest work

    A website never stands still, there are always new features or 3rd parties adding to it. These often also come with new page speed challenges. Make to-do's based on collected data so that the site is always fast.

    • Work with SEO or marketing to keep the website fast
    • Always a fast website for the visitors

  • All in one place

    Track Core Web Vitals per template

    We know that optimizations take place at the template level. Therefore, track all URLs within a given template.

    • Use regular expressions and/ or CSS selectors
    • See Core Web Vitals data at template level with URL deep-dive option

  • Find pagespeed optimizations

    Use filters and dimensions

    Using filters and dimensions, it is possible to cross filter and find out where problems come from.

    • See if visitors have a worse UX under certain conditions
    • Make optimizations for your own website visitors (device memory, internet speed, etc.)

The complete Core Web Vitals for developers toolkit at your fingertips

We know you love dashboards as a developer, but it can also take up a lot of your time. We display data in a way that makes it easy to interpret and translate to points of action.

All our real-time site speed monitoring features


Tips, tricks and advice on Core Web Vitals for developers

  • Does GA4 measure website speed in 2024?

    Website speed tracking is not built-in to Google Analytics 4. This limitation is relevant since tracking real visitors' speed can reveal its impact on user engagement and conversion rates. Such data is essential for identifying website speed issues and projecting the ROI of speed-optimization work.

    • Published on
    • Reading time ± 3 minutes
  • Hyvä fixes all my Magento pagespeed issues, right?

    At RUMvision, we understand why a fast webshop, a key benefit of using Hyvä themes, is crucial to you. Numerous factors can affect your site's speed, Core Web Vitals, and UX, ultimately impacting conversions. So, does Hyvä fix all performance problems? It's something our CEO Karlijn Löwik talked about at Meet Magento Netherlands 2023.

    • Published on
    • Reading time ± 4 minutes
  • 2023 slides

    How proud we are to have sponsored an event like this, because what a community this is. Welcoming, friendly, open and people are happy to explain everything to you. Together we all have one goal, and that is to make the internet faster for ourselves, but more importantly; the end user. Were you unable to attend 2023, but interested in the slides? Or do you simply want to watch the brilliant talks again? All of the slides from the talks are linked here.

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    • Reading time < 1 minute