diff --git a/views/bootstrap/class.AddDocument.php b/views/bootstrap/class.AddDocument.php
index 924ba0ee7..92ad726b1 100644
--- a/views/bootstrap/class.AddDocument.php
+++ b/views/bootstrap/class.AddDocument.php
@@ -241,7 +241,7 @@ console.log(params);
 			}
 		}
 		if(!$nodocumentformfields || !in_array('sequence', $nodocumentformfields)) {
-			$this->formField(getMLText("sequence"), $this->getSequenceChooser($folder->getDocuments('s')).($orderby != 's' ? "<br />".getMLText('order_by_sequence_off') : ''));
+			$this->formField(getMLText("sequence"), $this->getSequenceChooser($folder, 'd').($orderby != 's' ? "<br />".getMLText('order_by_sequence_off') : ''));
 		} else {
 			$minmax = $folder->getDocumentsMinMax();
 			if($this->params['defaultposition'] == 'start') {
diff --git a/views/bootstrap/class.AddSubFolder.php b/views/bootstrap/class.AddSubFolder.php
index 1cf7a286c..fea0a7f98 100644
--- a/views/bootstrap/class.AddSubFolder.php
+++ b/views/bootstrap/class.AddSubFolder.php
@@ -98,7 +98,7 @@ $(document).ready( function() {
 			)
 		);
 		if(!$nofolderformfields || !in_array('sequence', $nofolderformfields)) {
-            $this->formField(getMLText("sequence"), $this->getSequenceChooser($folder->getSubFolders('s')).($orderby != 's' ? "<br />".getMLText('order_by_sequence_off') : ''));
+            $this->formField(getMLText("sequence"), $this->getSequenceChooser($folder, 'f').($orderby != 's' ? "<br />".getMLText('order_by_sequence_off') : ''));
 		} else {
 			$minmax = $folder->getFoldersMinMax();
 			if($this->params['defaultposition'] == 'start') {
diff --git a/views/bootstrap/class.Bootstrap.php b/views/bootstrap/class.Bootstrap.php
index 37cfe7de5..18ff23438 100644
--- a/views/bootstrap/class.Bootstrap.php
+++ b/views/bootstrap/class.Bootstrap.php
@@ -1598,17 +1598,43 @@ $(document).ready(function() {
 		print "</select>";
 	} /* }}} */
 
-	function printSequenceChooser($objArr, $keepID = -1) { /* {{{ */
-		echo $this->getSequenceChooser($objArr, $keepID);
+	function printSequenceChooser($parent, $type, $keepID = -1) { /* {{{ */
+		echo $this->getSequenceChooser($parent, $type, $keepID);
 	} /* }}} */
 
-	function getSequenceChooser($objArr, $keepID = -1) { /* {{{ */
-		if (count($objArr) > 0) {
-			$max = $objArr[count($objArr)-1]->getSequence() + 1;
-			$min = $objArr[0]->getSequence() - 1;
+	/**
+	 * Return html code for sequence chooser
+	 *
+	 * This method will return the html code of the ѕelect menu for setting
+	 * the ѕequence number of a document or folder. The select menu will contain
+	 * a list of all siblings to select to positon relative to a sibling.
+	 * For performance reasons the select menu will not contain any siblings
+	 * if the number of siblings is greater than 50.
+	 *
+	 * @param $parent object parent folder of new or updated document/folder
+	 * @param $type string type of new object 'f'=folder, 'd'=document
+	 * @param $keepID integer id of current object
+	 */
+	function getSequenceChooser($parent, $type, $keepID = -1) { /* {{{ */
+		$objArr = [];
+		if($type == 'd') {
+			if(($c = $parent->hasDocuments()) < 50)
+				$objArr = $parent->getDocuments('s');
+			$minmax = $parent->getDocumentsMinMax();
+		} elseif($type = 'f') {
+			if(($c = $parent->hasSubFolders()) < 50)
+				$objArr = $parent->getSubFolders('s');
+			$minmax = $parent->getFoldersMinMax();
+		} else
+			return '';
+
+		if ($objArr) {
+			$min = $minmax['min']-1.0;
+			$max = $minmax['max']+1.0;
 		}
 		else {
-			$max = 1.0;
+			$min = (float) $minmax['min'];
+			$max = $minmax['max']+1.0;
 		}
 		$content = "<select name=\"sequence\">\n";
 		if ($keepID != -1) {
@@ -1616,7 +1642,7 @@ $(document).ready(function() {
 		}
 		if($this->params['defaultposition'] != 'start')
 			$content .= "  <option value=\"".$max."\">" . getMLText("seq_end");
-		if (count($objArr) > 0) {
+		if ($c > 0) {
 			$content .= "  <option value=\"".$min."\">" . getMLText("seq_start");
 		}
 		if($this->params['defaultposition'] == 'start')
diff --git a/views/bootstrap/class.EditDocument.php b/views/bootstrap/class.EditDocument.php
index 634d9f5ba..48c1d47c0 100644
--- a/views/bootstrap/class.EditDocument.php
+++ b/views/bootstrap/class.EditDocument.php
@@ -201,7 +201,7 @@ $(document).ready( function() {
 		}
 		if(!$nodocumentformfields || !in_array('sequence', $nodocumentformfields)) {
 		if ($folder->getAccessMode($user) > M_READ) {
-			$this->formField(getMLText("sequence"), $this->getSequenceChooser($folder->getDocuments('s'), $document->getID()).($orderby != 's' ? "<br />".getMLText('order_by_sequence_off') : ''));
+			$this->formField(getMLText("sequence"), $this->getSequenceChooser($folder, 'd', $document->getID()).($orderby != 's' ? "<br />".getMLText('order_by_sequence_off') : ''));
 		}
 		}
 		if($attrdefs) {
diff --git a/views/bootstrap/class.EditFolder.php b/views/bootstrap/class.EditFolder.php
index 4a44d5c2b..b7a47f479 100644
--- a/views/bootstrap/class.EditFolder.php
+++ b/views/bootstrap/class.EditFolder.php
@@ -108,7 +108,7 @@ $(document).ready(function() {
 		$parent = ($folder->getID() == $rootfolderid) ? false : $folder->getParent();
 		if(!$nofolderformfields || !in_array('sequence', $nofolderformfields)) {
 			if ($parent && $parent->getAccessMode($user) > M_READ) {
-				$this->formField(getMLText("sequence"), $this->getSequenceChooser($parent->getSubFolders('s'), $folder->getID()).($orderby != 's' ? "<br />".getMLText('order_by_sequence_off') : ''));
+				$this->formField(getMLText("sequence"), $this->getSequenceChooser($parent, 'f', $folder->getID()).($orderby != 's' ? "<br />".getMLText('order_by_sequence_off') : ''));
 			}
 		}
 		if($attrdefs) {
diff --git a/views/bootstrap4/class.Bootstrap4.php b/views/bootstrap4/class.Bootstrap4.php
index 8116d8d5f..65351411b 100644
--- a/views/bootstrap4/class.Bootstrap4.php
+++ b/views/bootstrap4/class.Bootstrap4.php
@@ -1627,17 +1627,43 @@ $(document).ready(function() {
 		print "</select>";
 	} /* }}} */
 
-	function printSequenceChooser($objArr, $keepID = -1) { /* {{{ */
-		echo $this->getSequenceChooser($objArr, $keepID);
+	function printSequenceChooser($parent, $type, $keepID = -1) { /* {{{ */
+		echo $this->getSequenceChooser($parent, $type, $keepID);
 	} /* }}} */
 
-	function getSequenceChooser($objArr, $keepID = -1) { /* {{{ */
-		if (count($objArr) > 0) {
-			$max = $objArr[count($objArr)-1]->getSequence() + 1;
-			$min = $objArr[0]->getSequence() - 1;
+	/**
+	 * Return html code for sequence chooser
+	 *
+	 * This method will return the html code of the ѕelect menu for setting
+	 * the ѕequence number of a document or folder. The select menu will contain
+	 * a list of all siblings to select to positon relative to a sibling.
+	 * For performance reasons the select menu will not contain any siblings
+	 * if the number of siblings is greater than 50.
+	 *
+	 * @param $parent object parent folder of new or updated document/folder
+	 * @param $type string type of new object 'f'=folder, 'd'=document
+	 * @param $keepID integer id of current object
+	 */
+	function getSequenceChooser($parent, $type, $keepID = -1) { /* {{{ */
+		$objArr = [];
+		if($type == 'd') {
+			if(($c = $parent->hasDocuments()) < 50)
+				$objArr = $parent->getDocuments('s');
+			$minmax = $parent->getDocumentsMinMax();
+		} elseif($type = 'f') {
+			if(($c = $parent->hasSubFolders()) < 50)
+				$objArr = $parent->getSubFolders('s');
+			$minmax = $parent->getFoldersMinMax();
+		} else
+			return '';
+
+		if ($objArr) {
+			$min = $minmax['min']-1.0;
+			$max = $minmax['max']+1.0;
 		}
 		else {
-			$max = 1.0;
+			$min = (float) $minmax['min'];
+			$max = $minmax['max']+1.0;
 		}
 		$content = "<select class=\"form-control\" name=\"sequence\">\n";
 		if ($keepID != -1) {
@@ -1645,7 +1671,7 @@ $(document).ready(function() {
 		}
 		if($this->params['defaultposition'] != 'start')
 			$content .= "  <option value=\"".$max."\">" . getMLText("seq_end");
-		if (count($objArr) > 0) {
+		if ($c > 0) {
 			$content .= "  <option value=\"".$min."\">" . getMLText("seq_start");
 		}
 		if($this->params['defaultposition'] == 'start')