Speed Up – Optimize CSS Delivery

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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.