Modern Web Performance: Lazy Loading, Code Splitting & Caching

The JavaScript Weight Problem

Modern web applications send megabytes of JavaScript to user browsers, causing slow load times, especially on mobile devices. Fast loading requires sending only the JavaScript and assets needed for the current viewport.

1. Code Splitting

Rather than compiling all your application code into a single massive bundle.js, code splitting breaks it into smaller chunks that load dynamically when specific pages or features are accessed.

2. Native Lazy Loading

Always lazy load images and iframes that are below the fold (offscreen) to save user bandwidth and speed up Initial Page Load.

<!-- Native lazy loading -->
<img src="hero.webp" alt="Hero" loading="eager">
<img src="footer-logo.webp" alt="Logo" loading="lazy">