Optimizing Script Placement for Web Performance

Published: 19 March 2025
on channel: Request Metrics
494
1

Master the art of loading JavaScript efficiently in this essential Concepts of Web Performance tutorial with Todd Gardner from Request Metrics. Perfect for entry-level web developers struggling with slow websites, this video breaks down the critical differences between standard blocking scripts, async, and defer attributes that dramatically impact your site's performance. Learn when and why to use each loading technique, understand how JavaScript execution blocks HTML parsing and CSS rendering through clear waterfall and flame chart visualizations, and discover why defer is usually your best option for most scenarios. By the end of this tutorial, you'll confidently implement optimal script loading strategies to eliminate parser blocking issues, speed up page rendering, and deliver a faster, smoother experience for your users without needing advanced technical knowledge.

🎥 Watch the Concepts of Web Performance videos:
   • Concepts of Web Performance  

Compatibility of JavaScript Modules:
https://caniuse.com/?search=modules

🧑‍🏫 Check out my full training on @FrontendMasters :
https://frontendmasters.com/courses/w...

🔥 Start monitoring your website performance with Request Metrics for FREE:
https://requestmetrics.com/

#webperformance #webdevelopment #sitereliabilityengineering


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