diff --git a/application/Espo/Core/Export/Csv.php b/application/Espo/Core/Export/Csv.php
index ebb350e028..1ddeaae91e 100644
--- a/application/Espo/Core/Export/Csv.php
+++ b/application/Espo/Core/Export/Csv.php
@@ -52,7 +52,7 @@ class Csv extends \Espo\Core\Injectable
         }
     }
 
-    public function process($entityType, $params, $dataList)
+    public function process(string $entityType, array $params, ?array $dataList, $dataFp = null)
     {
         if (!is_array($params['attributeList'])) {
             throw new Error();
@@ -67,10 +67,20 @@ class Csv extends \Espo\Core\Injectable
 
         $fp = fopen('php://temp', 'w');
         fputcsv($fp, $attributeList, $delimiter);
-        foreach ($dataList as $row) {
-            $preparedRow = $this->prepareRow($row);
-            fputcsv($fp, $preparedRow, $delimiter);
+
+        if ($dataFp) {
+            while (($line = fgets($dataFp)) !== false) {
+                $row = unserialize(base64_decode($line));
+                $preparedRow = $this->prepareRow($row);
+                fputcsv($fp, $preparedRow, $delimiter);
+            }
+        } else {
+            foreach ($dataList as $row) {
+                $preparedRow = $this->prepareRow($row);
+                fputcsv($fp, $preparedRow, $delimiter);
+            }
         }
+
         rewind($fp);
         $csv = stream_get_contents($fp);
         fclose($fp);
diff --git a/application/Espo/Core/Export/Xlsx.php b/application/Espo/Core/Export/Xlsx.php
index 221acedaf8..62886be6dd 100644
--- a/application/Espo/Core/Export/Xlsx.php
+++ b/application/Espo/Core/Export/Xlsx.php
@@ -146,7 +146,7 @@ class Xlsx extends \Espo\Core\Injectable
         }
     }
 
-    public function process($entityType, $params, $dataList)
+    public function process(string $entityType, array $params, ?array $dataList = null, $dataFp = null)
     {
         if (!is_array($params['fieldList'])) {
             throw new Error();
@@ -258,7 +258,24 @@ class Xlsx extends \Espo\Core\Injectable
         $typesCache = array();
 
         $rowNumber++;
-        foreach ($dataList as $row) {
+
+        $lineIndex = -1;
+        if ($dataList) {
+            $lineCount = count($dataList);
+        }
+
+        while (true) {
+            $lineIndex++;
+
+            if ($dataFp) {
+                $line = fgets($dataFp);
+                if ($line === false) break;
+                $row = unserialize(base64_decode($line));
+            } else {
+                if ($lineIndex >= $lineCount) break;
+                $row = $dataList[$lineIndex];
+            }
+
             $i = 0;
             foreach ($fieldList as $i => $name) {
                 $col = $azRange[$i];
@@ -611,4 +628,4 @@ class Xlsx extends \Espo\Core\Injectable
 
         return $xlsx;
     }
-}
\ No newline at end of file
+}
diff --git a/application/Espo/Services/Record.php b/application/Espo/Services/Record.php
index de3990fc41..0991fcc23b 100644
--- a/application/Espo/Services/Record.php
+++ b/application/Espo/Services/Record.php
@@ -2042,8 +2042,6 @@ class Record extends \Espo\Core\Services\Base
             $sth->execute();
         }
 
-        $dataList = [];
-
         $attributeListToSkip = [
             'deleted'
         ];
@@ -2089,6 +2087,8 @@ class Record extends \Espo\Core\Services\Base
             $fieldList = $exportObj->filterFieldList($this->entityType, $fieldList, $exportAllFields);
         }
 
+        $fp = null;
+
         if (is_null($attributeList)) {
             $attributeList = [];
             $seed = $this->getEntityManager()->getEntity($this->entityType);
@@ -2109,6 +2109,8 @@ class Record extends \Espo\Core\Services\Base
             $exportObj->addAdditionalAttributes($this->entityType, $attributeList, $fieldList);
         }
 
+        $fp = fopen('php://temp', 'w');
+
         if ($collection) {
             foreach ($collection as $entity) {
                 $this->loadAdditionalFieldsForExport($entity);
@@ -2120,8 +2122,10 @@ class Record extends \Espo\Core\Services\Base
                     $value = $this->getAttributeFromEntityForExport($entity, $attribute);
                     $row[$attribute] = $value;
                 }
-                $dataList[] = $row;
+                $line = base64_encode(serialize($row)) . \PHP_EOL;
+                fwrite($fp, $line);
             }
+            rewind($fp);
         } else {
             while ($dataRow = $sth->fetch(\PDO::FETCH_ASSOC)) {
                 $entity = $this->getEntityManager()->getEntityFactory()->create($this->getEntityType());
@@ -2137,8 +2141,11 @@ class Record extends \Espo\Core\Services\Base
                     $value = $this->getAttributeFromEntityForExport($entity, $attribute);
                     $row[$attribute] = $value;
                 }
-                $dataList[] = $row;
+
+                $line = base64_encode(serialize($row)) . \PHP_EOL;
+                fwrite($fp, $line);
             }
+            rewind($fp);
         }
 
         if (is_null($attributeList)) {
@@ -2168,7 +2175,9 @@ class Record extends \Espo\Core\Services\Base
         if (array_key_exists('exportName', $params)) {
             $exportParams['exportName'] = $params['exportName'];
         }
-        $contents = $exportObj->process($this->entityType, $exportParams, $dataList);
+        $contents = $exportObj->process($this->entityType, $exportParams, null, $fp);
+
+        fclose($fp);
 
         $attachment = $this->getEntityManager()->getEntity('Attachment');
         $attachment->set('name', $fileName);