Delay The Loading Of Images Until Needed – lazy-image
The lazy-image library allows to load image sources on-demand (e.g. click, in view, etc).
JavaScript & CSS lazy load
Delay Loading Of Iframe Embedded Content Until Clicking – lazyembed.js
lazyembed.js is a lazy loading library for iframe embedded content such as Youtube/Vimeo videos, Google Maps, etc. The library delays the loading of these iframe content until clicked, with custom placeholder support.
Vanilla JavaScript Library For Image Lazy Load – vanillaLazyLoad
Yet another vanilla JavaScript library that helps delay the loading of images until they become visible in the viewport.
Modern Retina-ready Image Lazy Loader – lazyestload.js
A modern, fast, lightweight image lazy load JavaScript library that provides 2 methods to lazy load images with support for retina and responsive images.
Lazy Load Youtube Video With JavaScript – llyv.js
llyv.js is a Youtube Video lazy load library which allows the user to load Youtube Video Players on demand.
Responsive Image Lazy Load JavaScript Library – responsivelyLazy
responsivelyLazy is an ultra-light javascript library which allows you to delay the loading of appropriate images based on the width of their parent containers.
Tiny JavaScript Library For Progressive Image Lazy Loading – Progressively
Just another fast, dependency-free JavaScript library used to lazy load images with a progressive blur loading effect as you seen on Medium or Instagram.
Lazy Load iFrame Embedded Content With JavaScript – lazyframe.js
lazyframe.js is a native JavaScript library used to delay the loading of iframe content for Google Maps, Youtube/Vimeo/Vine videos and so on.
Lazy Load & Pre-cache Images To Improve Page Speed – Img2
Img2 is a web component that lazy-loads and pre-caches images to improve the page loading time.
Fast High-Performance Lazy Load Library – LazyObserver.js
Just another JavaScript library which makes uses of the Intersection Observer API to provide the fast, performant and modern lazy loading functionality on your images within the document.