Add to cart is slow due to shipping cost calculation

If I had to guess it’s because they are running the add to cart handler (ex: WC_Form_Handler::add_to_cart_handler_simple() on each product you add to the cart. This results in calling WC()->cart->add_to_cart() which will run update_totals() for each product… which gets slow as you add more and more products simultaneously.

See:
https://github.com/woocommerce/woocommerce/blob/trunk/plugins/woocommerce/includes/class-wc-cart.php#L1276

and

https://github.com/woocommerce/woocommerce/blob/9db2c452905ebf796a8e8b4d63db64b57e169dbe/plugins/woocommerce/includes/class-wc-cart.php#L106

Can you advise a snippet to disable running update_total for every single item?

I found a snippet to prevent the slow add-to-cart. This is a big bug.

/*
Remove recalculation of shipping cost when Add-to-Cart. This prevents slow add-to-cart.
*/
function filter_need_shipping ($val) {
	$prevent_after_add = WC()->cart->prevent_recalc_on_add_to_cart;
	return $val && !$prevent_after_add;
}
add_filter( 'woocommerce_cart_needs_shipping', 'filter_need_shipping' );

function mark_cart_not_to_recalc ($cart_item_key, $product_id, $quantity, $variation_id, $variation, $cart_item_data) {
	WC()->cart->prevent_recalc_on_add_to_cart = true;
}
add_action('woocommerce_add_to_cart', 'mark_cart_not_to_recalc', 10, 6);

Hi,

Thank you for your input. Glad to hear that you have resolved this issue for your specific requirement. However, making this change might affect other sites that have been using the plugin for years expecting the current functionality. It might potentially break some functionality on another site. If anyone else faces a similar requirement as yours I will be sure to point them here.

Please feel free to write in if you have any further questions.

Regards,
Kartik

Hi. Can you add some function in Woocommerce, which we can use to prevent calculation on add to cart?