MAGETWO-54682: [Customer] Fast load of product options

 - MAGETWO-55913: Information about special price for Configurable option is not presented in catalog and product page

Author: kandy

app/code/Magento/ConfigurableProduct/Pricing/Price/ConfigurableOptionsProvider.php

@@ -77,7 +77,9 @@ public function getProducts(ProductInterface $product)
 
                 $this->products[$product->getId()] = $this->collectionFactory->create()
                     ->addIdFilter($productIds)
-                    ->addPriceData();
+                    ->addAttributeToSelect('*')
+                    ->addPriceData()
+                    ->addTierPriceData();
             } else {
                 $this->products[$product->getId()] = $this->configurable->getUsedProducts($product);
             }