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How can lazy loading improve web portal performance by reducing initial load times and optimizing resource usage? What are the best techniques to implement lazy loading in images, components, and data fetching using JavaScript frameworks like React, Vue, and Angular? How does lazy loading impact SEO and user experience?

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  • Latest Post Latest Post by Dani
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Hello,

The easiest way to implement image lazy loading is by simply adding the loading="lazy" HTML attribute to <img> image tags. That will not load the image until it is about to come into view in the web browser as the user scrolls down the page.

Something else that we do here at DaniWeb is to use the async and defer attributes on <script> HTML tags, so that they load external Javascript files asynchronously without blocking the parsing and rendering of the HTML page. Use defer if your Javascript file requires the HTML DOM to be ready, or relies on other Javascript files, and use async if you want the Javascript file to be executed the moment that it's finished downloading.

The goal, of course, is if you can't do everything within your power to make your site load as fast as possible, then focus on the user experience and perceived performance to the end user. An example of that is to use AJAX techniques to load portions of the webpage, that might be a little more computationally intensive, for example, with Javascript after the rest of the page has already been loaded for the user. Especially if the content would otherwise delay generating the HTML, and it's content that is below-the-fold (aka not visible on the first screen-fold).

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