Progressive Image Loader In Vanilla JavaScript – progressive-images
progressive-images is a vanilla javascript library to progressively and responsively load proper images depending on the current screen size.
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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.
Small Image Lazy Loader – yall.js
yall.js is a really small JavaScript library to lazy load images as the users scroll through your content heavy webpage. Supports srcset attribute and picture element.
Animated Radial Progress Bar In JavaScript – ToxProgress.js
A JavaScript library which makes use of plain HTML/CSS to create animated circular (radial) progress bars with several useful customization options.
Accurate Page Loading Indicator – realprogress.js
The realprogress.js JavaScript library displays a progress bar to indicate the accurate loading progress of your content-rich website.
Smart Image Lazy Load JS Library – image-defer.js
image-defer.js is a JavaScript library that smartly defers the loading of images to reduce the page load time and improve the UX.
Slim Progress/Loading Bar In Native JavaScript – loadbar
loadbar is a tiny native JavaScript plugin for creating a slim progress & loading bar which can be attached to any container or the whole document.
Progressive Image lazy Loading With Blur Effect
A small script to progressively load images with a blur effect.
Facebook-like Content Loader For Modern Web – mocka
mocka helps you create an animated content placeholder which can be used as a content loader as you seen in Facebook.com.
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).