WWOF – Optimize Wholesale Order Form Bulk Adds by Deferring Cart Recalculation

/**

 * Suppress WWP's per-item cart recalculation during Wholesale Order Form batch adds.

 * Defers to a single recalculation at the end of each batch request instead.

 *

 * Add to functions.php or a mu-plugin.

 * Requires: Wholesale Prices 2.2.8+, Wholesale Order Form 3.x+

 */

add_action( 'woocommerce_loaded', function () {

    // Only suppress during WWOF add-to-cart requests

    // (header sent by the Order Form's axios layer)

    if ( empty( $_SERVER['HTTP_X_WWOF_ADD_TO_CART'] ) ) {

        return;

    }

    // Remove WWP's per-add recalculation using the public singleton accessor

    remove_action(

        'woocommerce_add_to_cart',

        [ WWP_Wholesale_Prices::getInstance(), 'recalculate_cart_totals_for_wholesale_customer_on_add_to_cart' ],

        1

    );

    // Run one recalculation after all items in this batch are added,

    // before WooCommerce saves the cart session at shutdown priority 20

    add_action( 'shutdown', function () {

        if ( WC()->cart instanceof WC_Cart && ! empty( WC()->cart->get_cart() ) ) {

            WC()->cart->calculate_totals();

        }

    }, 5 );

} );