Defer Parsing of Astra Theme JS

functions.php

/**
 * Add async attr to the Astra Script.
 *
 * @param string $tag Tag for the script.
 * @param string $handle Handle for the script.
 *
 * @return string
 */
function add_async_attribute( $tag, $handle ) {
	if ( 'astra-theme-js' === $handle ) {
		return str_replace( ' src', ' async="async" src', $tag );
	}
	return $tag;
}

add_filter( 'script_loader_tag', 'add_async_attribute', 10, 2 );