The YouTube custom field is a simple and better method of embedding YouTube Videos. YouTube embed codes are a quick and easy way to add videos to your site, but embed codes can be an issue with text filters and restrictive WYSIWYG editors. The YouTube custom field takes all the hassle out of adding a YouTube Video to your content. A YouTube embed code can add over 500kb to your page load. The JoomlaXTC YouTube custom field plugin increases the speed of your site by not pre-loading the video and displaying the YouTube thumbnail instead of the iframe on page load. In addition to saving page load time, the JoomlaXTC Quick YouTube Plugin also adds Responsive mobile-ready video display.
JoomlaXTC – YouTube Custom Field v1.0 – Joomla Extension