diff --git a/UPGRADE.md b/UPGRADE.md
index e7acfbb..921825d 100644
--- a/UPGRADE.md
+++ b/UPGRADE.md
@@ -1,5 +1,7 @@
 # Upgrade Notes
 
+## 3.0.3
+- [IMPROVEMENT] fix memory issue when dealing with large lists (assets, documents, objects) (#41)
 ## 3.0.2
 - [LICENSE] Dual-License with GPL and Dachcom Commercial License (DCL) added
 ## 3.0.1
diff --git a/src/Service/Builder/AssetListBuilder.php b/src/Service/Builder/AssetListBuilder.php
index b32f246..d7a5325 100644
--- a/src/Service/Builder/AssetListBuilder.php
+++ b/src/Service/Builder/AssetListBuilder.php
@@ -32,10 +32,15 @@ public function buildByList(array $options): \Generator
     {
         $list = $this->getList($options);
 
-        foreach ($list->loadIdList() as $id) {
-            if ($asset = Asset::getById($id)) {
+        $idList = $list->loadIdList();
+        $length = count($idList);
+        for ($i = 0; $i < $length; $i++) {
+            if ($asset = Asset::getById($idList[$i])) {
                 yield $asset;
             }
+            if ($i % 400 === 0) {
+                \Pimcore::collectGarbage();
+            }
         }
     }
 
diff --git a/src/Service/Builder/DocumentListBuilder.php b/src/Service/Builder/DocumentListBuilder.php
index f8e3ab9..69fae90 100644
--- a/src/Service/Builder/DocumentListBuilder.php
+++ b/src/Service/Builder/DocumentListBuilder.php
@@ -32,10 +32,15 @@ public function buildByList(array $options): \Generator
     {
         $list = $this->getList($options);
 
-        foreach ($list->loadIdList() as $id) {
-            if ($doc = Document::getById($id)) {
+        $idList = $list->loadIdList();
+        $length = count($idList);
+        for ($i = 0; $i < $length; $i++) {
+            if ($doc = Document::getById($idList[$i])) {
                 yield $doc;
             }
+            if ($i % 400 === 0) {
+                \Pimcore::collectGarbage();
+            }
         }
     }
 
diff --git a/src/Service/Builder/ObjectListBuilder.php b/src/Service/Builder/ObjectListBuilder.php
index 2a62d54..31e42be 100644
--- a/src/Service/Builder/ObjectListBuilder.php
+++ b/src/Service/Builder/ObjectListBuilder.php
@@ -32,10 +32,15 @@ public function buildByList(array $options): \Generator
     {
         $list = $this->getList($options);
 
-        foreach ($list->loadIdList() as $id) {
-            if ($object = DataObject::getById($id)) {
+        $idList = $list->loadIdList();
+        $length = count($idList);
+        for ($i = 0; $i < $length; $i++) {
+            if ($object = DataObject::getById($idList[$i])) {
                 yield $object;
             }
+            if ($i % 400 === 0) {
+                \Pimcore::collectGarbage();
+            }
         }
     }