What are the best practices for lazy and eager loading in web development?

What are the best practices for lazy and eager loading in web development?

Lazy loading defers loading non-essential resources until they're needed, while eager loading loads them upfront. Best practices include using lazy loading for images and videos to improve performance, and eager loading for critical resources to ensure a smooth user experience.

Can you give me examples of when to use each loading strategy?

Sure! Use lazy loading for images in a long-scroll page, where users may not reach the bottom. Eager loading is ideal for critical CSS or JavaScript files that are necessary for the initial rendering of the page.

What tools can help implement these loading strategies?

You can use libraries like Lozad.js for lazy loading images and resources, and frameworks like React or Angular often have built-in support for eager loading.

Are there any performance metrics I should monitor?

Yes, monitor metrics like Time to First Byte (TTFB), First Contentful Paint (FCP), and overall page load time to evaluate the effectiveness of your loading strategies.