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CEO & Co-founder, RUMvision

Karlijn Löwik is CEO & Co-founder of RUMvision, on a mission to make web performance a business priority for every eCommerce company. Based in Groningen (NL), she’s an international web performance speaker, RUM-advocate, and champion for women in tech. She serves as co-chair for the RUM W3C Group and as a board member of Mage-OS NL. She coined the term Sitespeed User Experience (SUX), because let’s face it, good SUX sells!
Milliseconds can make a significant difference to eCommerce performance. Shopify research suggests that the gap between a 2.5-second delay and a one-second delay can cost as much as 30% of conversions. However, pursuing faster site speed can quickly become an endless exercise. This session challenges the assumption that a perfect Lighthouse score is necessary or that simply passing Core Web Vitals is enough. Designed for merchants and stakeholders, the session explains how to avoid spending development budgets on unfocused optimisation. It explores why chasing perfect Lighthouse scores may not deliver value, what real-user data can reveal, and why the strongest growth opportunities may sit in the 90th percentile rather than the standard P75. The session also covers how to address common Magento performance issues, identify third-party services that affect site speed and recognise the point at which further optimisation is no longer worthwhile.