//JavaScriptの読み込みを遅らせる
function defer_parsing_of_js( $url ) {
 	 	 if ( is_user_logged_in() ) 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 );