diff --git a/CHANGELOG.md b/CHANGELOG.md
index cc7a51d..6f2673d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 2022-05-26 4.6.4
+* Optimizing unloading of stock
+
 ## 2022-05-29 4.6.3
 * Types of deliveries and payments are displayed only for available stores
 
diff --git a/VERSION b/VERSION
index 7962f0f..101d404 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.6.3
\ No newline at end of file
+4.6.4
\ No newline at end of file
diff --git a/src/include/class-wc-retailcrm-inventories.php b/src/include/class-wc-retailcrm-inventories.php
index d526d96..5d0fa77 100644
--- a/src/include/class-wc-retailcrm-inventories.php
+++ b/src/include/class-wc-retailcrm-inventories.php
@@ -42,7 +42,7 @@ if (!class_exists('WC_Retailcrm_Inventories')) :
         /**
          * Load stock from RetailCRM
          *
-         * @return mixed
+         * @return void
          */
         protected function load_stocks()
         {
@@ -71,6 +71,10 @@ if (!class_exists('WC_Retailcrm_Inventories')) :
                         $product = retailcrm_get_wc_product($offer[$this->bind_field], $this->retailcrm_settings);
 
                         if ($product instanceof WC_Product) {
+                            if ($product->get_type() == 'external') {
+                                continue;
+                            }
+
                             if ($product->get_type() == 'variation' || $product->get_type() == 'variable') {
                                 $parentId = $product->get_parent_id();
 
@@ -85,39 +89,44 @@ if (!class_exists('WC_Retailcrm_Inventories')) :
 
                             $product->set_manage_stock(true);
                             $product->set_stock_quantity($offer['quantity']);
-                            $success[] = $product->save();
+                            $product->save();
                         }
                     }
                 }
 
-                if (!empty($variationProducts)) {
-                    foreach ($variationProducts as $id => $quantity) {
+                // Clearing the object cache after calling the function wc_get_products
+                wp_cache_flush();
+            } while ($page <= $totalPageCount);
+
+            if (!empty($variationProducts)) {
+                $chunks = array_chunk($variationProducts, 100, true);
+
+                foreach ($chunks as $chunk) {
+                    foreach ($chunk as $id => $quantity) {
                         $variationProduct = wc_get_product($id);
 
                         if (is_object($variationProduct)) {
                             $variationProduct->set_manage_stock(true);
                             $variationProduct->set_stock_quantity($quantity);
-                            $success[] = $variationProduct->save();
+                            $variationProduct->save();
                         }
                     }
-                }
-            } while ($page <= $totalPageCount);
 
-            return $success;
+                    wp_cache_flush();
+                }
+            }
         }
 
         /**
          * Update stock quantity in WooCommerce
          *
-         * @return mixed
+         * @return void
          */
         public function updateQuantity()
         {
             if ($this->retailcrm_settings['sync'] == WC_Retailcrm_Base::YES) {
-                return $this->load_stocks();
+                $this->load_stocks();
             }
-
-            return false;
         }
     }
 endif;
diff --git a/src/readme.txt b/src/readme.txt
index d4feff6..822ac84 100644
--- a/src/readme.txt
+++ b/src/readme.txt
@@ -82,6 +82,9 @@ Asegúrate de tener una clave API específica para cada tienda. Las siguientes i
 
 
 == Changelog ==
+= 4.6.4 =
+* Optimizing unloading of stock
+
 = 4.6.3 =
 * Types of deliveries and payments are displayed only for available stores
 
diff --git a/src/retailcrm.php b/src/retailcrm.php
index 2ca8f23..e586d95 100644
--- a/src/retailcrm.php
+++ b/src/retailcrm.php
@@ -5,7 +5,7 @@
  * Description: Integration plugin for WooCommerce & Simla.com
  * Author: RetailDriver LLC
  * Author URI: http://retailcrm.pro/
- * Version: 4.6.3
+ * Version: 4.6.4
  * Tested up to: 6.0
  * WC requires at least: 5.4
  * WC tested up to: 6.9
diff --git a/src/uninstall.php b/src/uninstall.php
index 30aae38..5c601aa 100644
--- a/src/uninstall.php
+++ b/src/uninstall.php
@@ -16,7 +16,7 @@
  *
  * @link       https://wordpress.org/plugins/woo-retailcrm/
  *
- * @version    4.6.3
+ * @version    4.6.4
  *
  * @package    RetailCRM
  */
diff --git a/tests/test-wc-retailcrm-inventories.php b/tests/test-wc-retailcrm-inventories.php
index 79a5360..4cdda9f 100644
--- a/tests/test-wc-retailcrm-inventories.php
+++ b/tests/test-wc-retailcrm-inventories.php
@@ -57,9 +57,9 @@ class WC_Retailcrm_Inventories_Test extends WC_Retailcrm_Test_Case_Helper
         }
 
         $retailcrm_inventories = new WC_Retailcrm_Inventories($retailcrm);
-        $result = $retailcrm_inventories->updateQuantity();
+        $retailcrm_inventories->updateQuantity();
 
-        $this->checkProductData($retailcrm, $response, $result, 'simple');
+        $this->checkProductData($retailcrm, $response, $offer->get_id(), 'simple');
     }
 
     /**
@@ -86,9 +86,9 @@ class WC_Retailcrm_Inventories_Test extends WC_Retailcrm_Test_Case_Helper
         }
 
         $retailcrm_inventories = new WC_Retailcrm_Inventories($retailcrm);
-        $result = $retailcrm_inventories->updateQuantity();
+        $retailcrm_inventories->updateQuantity();
 
-        $this->checkProductData($retailcrm, $response, $result, 'variation');
+        $this->checkProductData($retailcrm, $response, $childrens[0], 'variation');
     }
 
     public function test_sync_off()
@@ -104,19 +104,16 @@ class WC_Retailcrm_Inventories_Test extends WC_Retailcrm_Test_Case_Helper
         $this->assertEquals(false, $result);
     }
 
-    private function checkProductData($retailcrm, $response, $result, $entity)
+    private function checkProductData($retailcrm, $response, $offerId, $entity)
     {
+        $product = wc_get_product($offerId);
+
         if ($retailcrm && null !== $response) {
-            $product = wc_get_product($result[0]);
             $this->assertInstanceOf('WC_Product', $product);
             $this->assertEquals($entity, $product->get_type());
             $this->assertEquals(10, $product->get_stock_quantity());
-            $this->assertEquals($result[0], $product->get_id());
-            $this->assertInternalType('array', $result);
-        } elseif (null === $response) {
-            $this->assertEquals(false, $result);
         } else {
-            $this->assertEquals(null, $result);
+            $this->assertNotEquals(10, $product->get_stock_quantity());
         }
     }