Everyone prefers to have a single score so they can easily understand where they stand. In our niche, Lighthouse is the best example. So we copied that idea, but then based on pagespeed numbers of your real users.
There are numerous solutions for measuring Core Web Vitals. But how do you select the right one? Learn about the differences between lab data tools like Lighthouse, field data tools like Pagespeed Insights, and real-time user monitoring like RUMvision.
There are numerous tools available for measuring the speed of your website, making it difficult to choose. This article explains why you should not always rely on the most popular tool, Google Lighthouse.
Online gambling is one of the most speed-sensitive industries on the web. Your users arrive with intent, in the moment, often on mobile, often during a live event where seconds decide whether a bet ge
Partnerships often start with a good conversation. We met Niels, one of the founders of TAGGRS, at an event in Amsterdam. While talking about tracking, privacy and website performance, we quickly r
Slides and more info on the talk "How fast is fast enough" at Meet Magento UK, July 7th London
Traffic from AI, bots, and crawlers (ABCs) amounts to about 51% of all online traffic. For a company specifically tracking real users that raises a challenge. Who is fake? Who is real? And how do you filter that out?
It’s 2026 and we are still talking about optimizing web performance. You might think, haven’t we solved this by now, is every site not fast by default? And the answer to that: no definitely not. And passing Core Web Vitals? Just means you did not frustrate most of your users.
You switched to better hosting. Or you're paying good money for it already. And yet, your Core Web Vitals are still orange. Maybe even red. So... was the hosting a waste of money?No. But it was never going to be the whole story either. Let's break down what hosting can fix, what it can't, and how to find out which one is holding your shop back.
Core Web Vitals are great at telling you how a page performs. But they do not always tell you when a specific part of that page became available to users.
If you've ever wondered who's behind the technical side of RUMvision, it's Erwin. CTO, co-founder, Google Developer Expert, and international speaker. He built version 1.0 during his paternity leave, in the hours when his daughter Hannah was asleep. Four years later, with 2.0 now live, his role is changing. And that's precisely what he wanted.
RUMvision v5 is a broader tracking architecture update focused on more reliable data collection, improved SPA navigation cleanup, better beacon handling and closer alignment with modern browser APIs, while leaving older compatibility layers behind.
It is a common web performance headache: you have optimized your hero images and streamlined your CSS, but your LCP scores are still stuck in the "yellow" zone. Often, the bottleneck isn't the file size- it is the order in which the browser decides to download it.
Single Page Applications have always been a bit of an awkward fit for Core Web Vitals. And not because SPAs are inherently slow.
Sunshine, coding, webperformance and knowing your Core Web Vitals issues without clicking? What a life!
Health Checks analyze your real user data and turn it into clear, actionable insights. Instead of spending time hunting for performance issues yourself, RUMvision now finds them for you. Spend less time hunting and more time fixing issues.
Super proud moment, RUMvision 2.0 is LIVE 🎉 It has taken a lot of hard work, a lot of talking, and - most importantly - a lot of listening to our clients. But this new version truly puts the "vision" into RUM. Let us tell you what we've build and how it can help your business.
Karlijn is the person who translates web performance into something everyone can understand. She's CEO and co-founder of RUMvision, co-chair of the W3C RUM Community Group, board member of Mage-OS NL, and the one who coined SUX (Sitespeed User Experience). Because good SUX sells.She speaks at conferences across the world, sits at the table with Google and other browser vendors, and runs a company with her husband. She also spent this morning vacuuming the office before this interview.
Roderik is the one thinking three steps ahead, turning technical possibilities into business models. He’s our co-founder and oversees business development, business administration, partnerships, and marketing strategy, but you probably won’t see him on stage or in your inbox. Next to RUMvision, he’s been running his own marketing company since 2009.
We’re launching a new version of RUMvision. Our 2.0 model is a rebuilt foundation with new features we’ve been working on for months. Here’s what that means for you.