Lazy Loading

Lazy loading is a programming technique that delays loading resources until needed.

For example, a webpage in which images are not loaded until the user scrolls down to that location on that page. Lazy loading is also used in the web and some software programs for mobile and desktop applications.

Lazy Loading Web

Lazy loading of images on a web page can also speed up the page’s load time as the browser does not need to load the images that are not visible to the user.

As the user scrolls into the page, images also load slowly dynamically. This process is accomplished using JavaScript that detects each image’s position and determines whether it is in the viewable area of ​​the browser window.

If the user scrolls down to an image, then JavaScript again requests the webserver for the resource, and then that image is displayed on the page. If the user does not scroll down, then the image does not load at all.

It can delay loading other resources such as JavaScript files, CSS, and even HTML.

For example, a web developer determines which CSS styles are needed in a webpage for “above-the-fold” content or the height of the content viewable for a typical browser window.

The developer implements all of these as “inline styles,” or styles defined under the web page’s HTML. JavaScript loads additional CSS once the page is loaded or once the user starts scrolling.

Lazy loading video is also viral on the web. This is much more effective because video files are usually the most significant resources loaded on a webpage. Instead of sending the entire video to the client’s device, the webserver sends only some of the video while watching it.

Popular video sharing websites such as YouTube and Vimeo use lazy loading to reduce their bandwidth and prevent users from downloading more video content than they need.

This is very helpful for those users who use metered Internet connections, such as mobile data plans.

When the lazy loading process of a video is taking place, it is widespread that a few seconds or a few minutes of that video have already been loaded, compared to the current point of that video. This video data is saved in a buffer, which helps videos play smoothly when the Internet connection is not consistent.

In Lazy Loading Software Programs

While lazy loading has become very popular on the web, it is being used for a long time in software development.

For example, an operating system only displays thumbnail images, visible icons in a folder.

At the same time, an image viewing program also only loads visible images into a photo library. With this, they use insufficient memory and improve the application performance simultaneously because the programs do not load unnecessary data in such a way.

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