Question Calling this BuyProductID and ios show the purchase page is slow

why i calling this BuyProductID and ios show the purchase page is slow? it 's more time then other game.
any ideas?

Code (CSharp):

1. void BuyProductID(string productId)
2.     {
3.         if (IsInitialized())
4.         {
5.             UnityEngine.Purchasing.Product product = m_StoreController.products.WithID(productId);
6.  
7.             if (product != null && product.availableToPurchase)
8.             {
9.                 MyDebug(string.Format("Purchasing product:" + product.definition.id.ToString()));
10.                 m_StoreController.InitiatePurchase(product);
11.             }
12.             else
13.             {
14.                 MyDebug("BuyProductID: FAIL. Not purchasing product, either is not found or is not available for purchase");
15.             }
16.         }
17.         else
18.         {
19.             MyDebug("BuyProductID FAIL. Not initialized.");
20.         }
21.     }

 

I'm experiencing the same issue when compared to other apps. I suspect the problem is about the number of products initialized which is around 400. But I don't have any clue rather than that.

 

in testfight or sandbox? normally, the live server should be much quicker.

 

It's the same for sandbox, Testflight, and production.