What is Lazy Loading?

Lazy Loading is a performance optimization technique that defers the loading of off-screen content until it is needed. This means that resources such as images or components that are not immediately visible to the user are not loaded until they are about to enter the viewport, which helps improve page performance and reduces initial load time.

When to use Lazy Loading?

Lazy Loading should be used when you have a large amount of content that is not visible on the initial page load. This is particularly useful for images, videos, or any heavy resources that can slow down the loading time of a webpage. By implementing Lazy Loading, you enhance user experience by allowing quicker access to visible content.

When not to use Lazy Loading?

Lazy Loading should be avoided for critical content that needs to be visible immediately upon page load. For instance, if important images or data are crucial for the initial user experience, loading them immediately is preferable to ensure a seamless interaction. Additionally, overly aggressive Lazy Loading can lead to situations where users may not see content they expect until they scroll, which can be frustrating.

What is the anatomy of Lazy Loading?

The anatomy of Lazy Loading involves several key components: a placeholder for off-screen content, an event listener to detect when the content is about to enter the viewport, and a loading mechanism that retrieves the content when needed. This mechanism often includes intersection observers or scroll event listeners that trigger the loading of content as users navigate through the page.