Do not send quote requests from other pages than in the order tunnel

lowcostexpress.php

@@ -679,6 +679,15 @@ public function getOrderShippingCost($cart, $shipping_cost)
 
         // No quote found. Generating a new one.
         if (!$quote) {
+
+            // We only try to get new quotes when we are in the order tunnel.
+            // Otherwise, Prestashop has a tendency to try to always get a shipping cost,
+            // Which can significantly slow down user experience.
+            $controller_name = $this->context->controller->php_self;
+            if (!in_array($controller_name, array('order-opc', 'order', 'orderopc'))) {
+              return false;
+            }
+
             $delivery_address = new Address((int) $cart->id_address_delivery);
             $delivery_country = new Country((int) $delivery_address->id_country);