Dequeue a style file which is making website load slow!

function wp_dequeue_kirki_style()
{

    wp_dequeue_style('kirki-styles');
}
add_action('wp_enqueue_scripts', 'wp_dequeue_kirki_style');

Please make sure that you have handler name kirki-styles in the parent theme for the css file that you want to remove. Because wp_dequeue_style function used handler as parameter. You can check documentaion of dequeue function here => https://developer.wordpress.org/reference/functions/wp_dequeue_style/