Async vs Defer: Script Loading Explained
In this video, we dive deep into how the browser handles script loading and execution with the async and defer attributes.
Learn how scripts download in parallel without blocking HTML parsing, and how the event loop notifies the main thread when scripts are ready to execute. We’ll also explain when and why you should use async for non-critical scripts and defer for scripts that depend on a fully parsed DOM.
Optimize your web performance by understanding how these attributes can speed up your page load times!