Speed Up – Optimize CSS Delivery

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This plugin load the stylesheets asynchronously and improve page load times.

Author:Simone Nigro (profile at wordpress.org)
WordPress version required:3.5
WordPress version tested:6.0.3
Plugin version:1.0.11
Added to WordPress repository:08-12-2016
Last updated:05-03-2023
Rating, %:100
Rated by:8
Plugin URI:http://wordpress.org/plugins/speed-up-optimiz...
Total downloads:56 767
Active installs:1 000+
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This small plugin (5 Kb) loads the stylesheets asynchronously and improve page load times.

The recommended use of this plugin is to load your vital stylesheets synchronously and non-vital CSS files asynchronously.
Non-vital CSS-files can be for example: fonts, icons, before the fold template-specific CSS, etc.

You can choose which files to load synchronously with a filter in your function.php, eg.:

// exclude main and child stylesheets from delivery optimization
function exclude_from_delivery_optimization($handle){
    return in_array($handle, array('main-stylesheet', 'child-stylesheet'));
}
add_filter('speed-up-optimize-css-delivery', 'exclude_from_delivery_optimization');

Note: this only works if your other plugins and theme add the CSS correctly.

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