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WP Deferred Javascripts

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

1 review
Average Rating
4 stars
4.1 out of 5 stars
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4 stars
Works as advertised
By , for WP 3.6.1

This is the very first plugin that managed to load my scripts asynchronously, without breaking my site.

All I had to do was to exclude 'jquery' and 'cycle' from deferral, in my functions.php of my child-theme...

add_filter('do_not_defer','scripts_to_not_defer');
function scripts_to_not_defer(){
	return array('jquery', 'cycle');
}

due to a slider plugin I'm using.

I took off one star because of 2 things:

  1. No back-end settings (e.g. for the exclusions).
  2. It forcefully appends query strings with the current wp version at the url of the scripts.

The second one is not a biggie, but it hurts the GTmetrix PageSpeed ratings.

It can be easily fixed though by replacing...

$ver = ( ! empty( $wp_scripts->registered[ $d ]->ver ) ) ? $wp_scripts->registered[ $d ]->ver : get_bloginfo( 'version' );

with...

$ver = ( ! empty( $wp_scripts->registered[ $d ]->ver ) ) ? $wp_scripts->registered[ $d ]->ver : null;

That is: null instead of get_bloginfo( 'version' )

Please also note, that the line to be fixed appears twice inside the plugin's php file.

I haven't tested the plugin extensively, but I'm quite happy I finally found one that works.

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