Parallel Script Loader To Speed Up & Modernize Websites: HeadJS

Head.js is a sort of mashup of a script loader, a feature detector, and an HTML5 shiv/shim in just over 2kb of JavaScript. It allows you to include multiple script requests within one chained call.

It gives different configurations for loading and execution of scripts. For instance, you can load in parallel and execute either in order or in the order they arrive.

With Head JS your scripts load like images – completely separated from the page rendering process. It can make your pages load 100% or even 400% faster and it can make a largest impact on client side optimization.