JavaScript lazy loading improves page speed by loading images, videos, or content only when users scroll them onto the screen.
Full Content:
What is JavaScript Lazy Loading?
JavaScript lazy loading is a web development strategy used to defer the loading of non-critical resources—such as images, videos, and other media—until they are needed (i.e., when a user scrolls close to them). This technique significantly reduces initial page load times and conserves bandwidth.
How It Works:
- Instead of loading all content during the initial page render, JavaScript listens for user scroll events.
- When a lazy-load-enabled element is about to enter the viewport, it triggers a load.
- This is often implemented using the
IntersectionObserverAPI or third-party libraries.
Benefits of JavaScript Lazy Loading:
- Faster initial page load
- Reduced bounce rate
- Improved mobile user experience
- Positive impact on SEO through better Core Web Vitals
- Saves server and network resources by avoiding unnecessary media loads
