Critical CSS: Enhancing Web Performance and User Experience

This 17-minute conference talk by Sergey Labuts from React Day Berlin 2024 explores Critical CSS as a powerful method to improve website performance and user experience. Learn what Critical CSS is and discover best practices for effective implementation. The presentation methodically covers the entire process, starting with an introduction to Critical CSS fundamentals, analyzing trade-offs, identifying and extracting critical styles, integration and testing procedures, understanding Criticals and BISTIs concepts, optimization techniques, and finally practical implementation steps. Watch the complete talk in 1080p on the GitNation website for a comprehensive understanding of how to fix slow-loading websites through optimized CSS delivery.

Syllabus

00:00 Introduction to Critical CSS
03:07 Understanding Critical CSS Trade-offs
06:14 Identifying and Extracting Critical CSS
08:48 Integrating and Testing Critical CSS
11:05 Criticals and BISTIs
13:24 Optimizing Critical CSS
15:42 Implementing Critical CSS