Use CDN for Font Awesome

function ultra_setup_extras() {
    wp_dequeue_style( 'font-awesome' );
    wp_enqueue_style( 'cdn-font-awesome', 'https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css', array(), '4.6.3' );
}
add_action( 'wp_enqueue_scripts', 'ultra_setup_extras', 80 );