Smart LazyLoad – Lazy Load Images, Videos and Iframes vs Youtube Playlist Thumbs

Smart LazyLoad is a fast, lightweight, and SEO-friendly lazy loading plugin for WordPress. It improves page speed and Core Web Vitals by loading images, iframes, videos, and background images only when they are about to enter the viewport. Built with pure JavaScript, Smart Lazy Load does not rely on jQuery or other third-party libraries, keeping your site fast and bloat-free. Unlike heavy optimization plugins, Smart LazyLoad focuses on one thing only: reducing unnecessary resource loading while maintaining compatibility, accessibility, and SEO best practices. All features are optional — you can use the plugin with default settings or fine-tune it as needed. Features Lazy load images in posts, pages, widgets, thumbnails, avatars, and comments Lazy load iframes and embedded videos Lazy load background images from inline styles and data attributes Optional YouTube iframe replacement with video thumbnails Intelligent first-image skipping for better LCP scores Supports both JavaScript-based and native browser lazy loading Inline plugin CSS and JavaScript (optional) Option to disable lazy loading for logged-in users Fully responsive and mobile-friendly SEO-friendly with noscript fallbacks Accessibility-aware Pure JavaScript (no jQuery dependency) Lightweight and performance-focused Open source and available on GitHub Configuration You can configure the plugin from: Settings → LazyLoad Available options include: Enable or disable lazy loading Lazy load images, iframes, and videos Enable background image lazy loading Replace YouTube videos with thumbnails Adjust lazy load threshold Enable native browser lazy loading Inline plugin CSS and JavaScript Disable lazy loading for logged-in users Need more help? For detailed documentation, usage examples, available filters, and advanced configuration options for Smart LazyLoad are available. See the Lazy Load Configuration Guide Support We are here to help. Feel free to open a new thread on the Support Forum.

Demo Install and activate the plugin. Insert the [ypt playlist_id=] shortcode in your page or post and insert your playlist ID after the equal. When that content is published and viewed, a Youtube player will appear and a column of thumbnails will load to the right of the player. Clicking the thumbnails switches between videos. This plugin includes a small CSS file for minimal styling that was written to target the specific IDs of the thumb list and player. Youtube Playlist Thumbs plugin depends on the Youtube Iframe API. Any bugs experienced with that service will affect this plugin. Please check for bugs with Youtube Iframe API before reporting a bug for this plugin. See “Other Notes” for usage. Usage Place this shortcode in your posts or pages and insert your Youtube Playlist ID after the equal. [ypt playlist_id=] To get a Youtube Playlist ID, copy the string after ‘&list=’ when viewing a playlist on Youtube.com. See screenshot #3. To trigger the playback of an ordered video in the playlist, add this attribute to the clickable element: data-ypt-index="X" Where ‘X’ is the order number of the video with the first video starting at 0. The third video would be 2. For example: Click to play the third video. The ‘Now Playing’ thumbnail text and arrow is inserted by CSS. Add this rule to your CSS to change it: #ypt_thumbs .ypt-now-playing > span::after { content: "YOUR NEW TEXT" !important; } The height of the list of thumbnails is set by Javascript. It is first set when the player is ready and it adjusts when the window changes size. If you are using modals or any dynamic method to show/hide the player, you will need to trigger this function when the player is shown: yptThumbHeight(); For example, with Bootstrap modals: $('#videoModal').on('shown.bs.modal', function (e) { //modal shows yptThumbHeight(); //update the thumb height }); A Javascript event triggers at the end of a playlist. It can used to trigger other events: jQuery(document).on('playlistEnd', function () { //playlist finished last video alert("That's all, thanks for watching!"); //do something });