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function defer_parsing_of_js($url) { if (is_admin()) return $url; //don't break WP Admin if (false === strpos($url, '.js')) return $url; if (strpos($url, 'jquery.js')) return $url; return str_replace(' src', ' defer src', $url); } add_filter('script_loader_tag', 'defer_parsing_of_js', 10);