Infinite Scrolling, also known as endless scrolling, is a technique that is widely used by websites and Web applications that host lots of content on a page where pagination would traditionally have been used. Infinite scrolling involves initially loading only one page of content. As the user scrolls down, the browser fetches another page via an AJAX request. There are several Infinite Scrolling plugins that facilitate this technique in modern browsers.

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TL;DR: Re-use your DOM elements and remove the ones that are far away from the viewport. Use placeholders to account for delayed data.