Disable Swift on add to cart

<?php

/**
 * Plugin Name: Swift Performance Tweaks
 */

if (isset($_POST['add-to-cart']) && !empty($_POST['add-to-cart'])){
    add_filter('option_active_plugins', function($active_plugins){
        if (($key = array_search('swift-performance/performance.php', $active_plugins)) !== false) {
            unset($active_plugins[$key]);
        }
    });
}

?>