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PodRocket - A web development podcast from LogRocket
You're Probably Doing Web Performance Wrong with Sia Karamalegos
Feb 6, 2025
Sia Karamalegos, a performance engineer and Google Developer Expert in web technologies, shares his insights on common web performance mistakes. He emphasizes the limitations of relying solely on Lighthouse scores and advocates for Real User Monitoring (RUM) to truly understand user experiences. Sia discusses the significance of Core Web Vitals and the challenges posed by non-Chromium browsers. He provides actionable advice for developers to enhance performance metrics and effectively utilize data for optimizing web performance.
27:11
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Quick takeaways
- Relying solely on Lighthouse scores can mislead developers about web performance since it doesn't account for real-world user conditions.
- Real User Monitoring (RUM) enables developers to prioritize optimizations based on actual user experiences rather than lab test results.
Deep dives
The Limitations of Lab Testing for Web Performance
Lab testing, such as that conducted with tools like Lighthouse, provides metrics based on controlled testing environments which often ignore the varied real-world conditions users experience. While lab testing is useful for debugging, it captures only a single instance, failing to account for users on different devices and networks, which can mislead developers about performance issues. Developers often operate on high-end devices, which do not represent the performance metrics experienced by average users. To truly understand web performance, it is crucial to begin monitoring how actual users interact with the website, as their experiences reveal the real bottlenecks that may be missed in controlled testing.
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