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SyliusCon 2025 | Core Web Vitals Debugging with DevTools - Erwin Hofman (RUMvision)

A fast website isn’t just a luxury - it’s a necessity. In this highly practical session, Erwin Hofman, Co-Founder and CTO of RUMvision, shows developers how to turn Chrome DevTools into their everyday performance powerhouse.

With over 20 years of experience as a Web Performance Consultant and Google Developer Expert, Erwin has helped brands like Danone and Wehkamp speed up their sites, reduce layout shifts, and build faster, frustration-free user experiences.

In this talk, Erwin walks you through the latest updates in Chrome DevTools - including the Performance panel, “Ask AI” assistant, and Extensibility API - revealing how to trace, analyse, and fix real-world performance issues that affect your Core Web Vitals.

You’ll learn how to detect layout shifts, isolate long tasks, and identify what’s really slowing your pages down, using the same tools trusted by the Chrome engineering team itself.

If you’ve ever felt intimidated by the Performance tab or unsure where to start debugging, this session will make it all click - literally.

🎤 Featuring: Erwin Hofman, CTO & Co-Founder at RUMvision
📍 Recorded live at SyliusCon 2025