Defer the loading of all JavaScripts added with wp_enqueue_script(), using LABJS (an asynchronous javascript library).

WP Deferred JavaScripts

This plugin defer the loading of all JavaScripts added by the way of <code>wp_enqueue_script()</code>, using LABJS. The result is a significant optimization of loading time.
It is compatible with all WordPress JavaScript functions (<code>wp_localize_script()</code>, js in header, in footer&#8230;) and works with all well coded plugins.
If a plugin or a theme is not properly enqueuing scripts, your site may not work. Check this page: <a href="https://codex.wordpress.org/Function_Reference/wp_enqueue_script" rel="nofollow ugc">Function Reference/wp_enqueue_script on WordPress Codex</a>.
LABjs (Loading And Blocking JavaScript) is an open-source (MIT license) project supported by <a href="http://getify.com/" rel="nofollow ugc">Getify Solutions</a>.
We performed a range of tests to determine the potential benefit of loading time. On <a href="http://wabeo.fr" rel="nofollow ugc">wabeo</a> we executed <a href="http://webwait.com/" rel="nofollow ugc">webwait</a> (150 calls by test). Result is this plugin could improve your loading time by 25%!! 
More information in the <a href="https://wordpress.org/extend/plugins/wp-deferred-javascripts/screenshots/" rel="ugc">Screenshots section</a>.
You can find <a href="http://www.seomix.fr/wp-deferred-javascript/" rel="nofollow ugc">more information about WP Deferred JavaScripts</a> and <a href="http://wabeo.fr/blog/wordpress-javascripts-asynchrones/" rel="nofollow ugc">technical information about asynchronous scripts</a> on authors blogs.

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