Head.js is a script to asynchronously load and manage dependencies of javascript and CSS assets.
Plugin Tag: asynchronous
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Asynchronous Javascript
Improve page load performance by asynchronously loading javascript using head.js
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Speed Up – Optimize CSS Delivery
This plugin load the stylesheets asynchronously and improve page load times.
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Async JS and CSS
Converts render-blocking CSS and JS files into NON-render-blocking, improving performance of web page.