Pure JavaScript Library For Lazy Loading Images & Videos – lazyload.js
lazyload.js is a stand-alone JavaScript library for lazy loading images and videos without any dependencies.
JavaScript & CSS lazy load
Lazy Load Vimeo Video Player Until You Click The Thumbnail – Vimeo LazyLoad
Vimeo LazyLoad loads Vimeo video player on-demand when the user clicks on the play button & thumbnail image.
Load Youtube Video Only When Needed – Youtube LazyLoad
Yet another Youtube lazy loader that delays the loading of Youtube video player to improve the performance of your web page.
Intersection Observer Based Image Lazy Load Library – io-lazyload
io-lazyload is an extremely fast JavaScript library for lazy loading images/ifames/backgrounds that uses IntersectionObserver API to handle position detection.
Responsive Image Lazy Load JS Library – lazysizes
lazysizes is an easy yet robust JS library used to delay the loading of images (iframes, scripts, etc) until they come into view.
Performant Element lazy Load Library – Lozad
Lozad is a small, highly performant JavaScript library used to lazy load any html elements (e.g. images, videos, etc.) using Intersection Observer Web API.
Progressive Image Lazy Loading Library – with-preview
with-preview is a JavaScript for modern image lazy loading effect that progressively blurs and fades in images when they’re scrolled into view.
Performant Image Lazy Loading Library – Turtle.js
A lightweight, high-performance image lazy loading library that uses Intersection Observer API to detect whether your images are visible in the viewport.
Lazy Load Image With Placeholder And Fallback – imagebuddy
imagebuddy is a pure JavaScript plugin for lazy loading images with support for custom placeholder and fallback.
Small Image/Video/Iframe Lazy Loader – yall.js
yall.js is a really small JavaScript library to lazy load images, videos, iframe contents and background images as the users scroll through your content-heavy webpage.