pushState + ajax = pjax
Very lightweight progress bars. No jQuery
Pilpil - Progressive Image Loading
PxLoader is a simple JavasScript library for creating preloaders and resource downloaders for HTML5 apps.
A small, fast, modern, and dependency-free library for lazy loading.
Lazy load XT is a jQuery plugin for images, videos and other media
Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jade, coffee, css, less, ... and your custom stuff.
Version of the QueryLoader by Gaya Design. Preload images with ease.
Load modules on demand (lazy load) in AngularJS
A minimal AMD API implementation for use after optimized builds
Loads images, scripts, styles, iframes, videos and audio asynchronously.
A Module Loader for the Web