diff --git a/CHANGELOG.md b/CHANGELOG.md
index c68c8de..95c290f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
         - **.PATCH**: Pull Request Title (PR Author) [PR Number](Link to PR)
 -->
 #### 6.7
+- **.12**: Fixed a bug that caused the file-tree construction to slow down significantly. [#1126](https://github.com/preservim/nerdtree/pull/1126)
 - **.11**: Fix exception in NERDTreeFind (on windows OS and If the file is located in the root directory of the disk)  [#1122](https://github.com/preservim/nerdtree/pull/1122)
 - **.10**: Do not consider the tree root to be "cascadable". (lifecrisis) [#1120](https://github.com/preservim/nerdtree/pull/1120)
 - **.9**: Force `:NERDTreeFocus` to allow events to be fired when switching windows. (PhilRunninger) [#1118](https://github.com/preservim/nerdtree/pull/1118)
diff --git a/lib/nerdtree/tree_dir_node.vim b/lib/nerdtree/tree_dir_node.vim
index 14d2996..d2ad1cd 100644
--- a/lib/nerdtree/tree_dir_node.vim
+++ b/lib/nerdtree/tree_dir_node.vim
@@ -431,6 +431,7 @@ function! s:TreeDirNode._initChildren(silent)
         endtry
     endfor
 
+    let g:NERDTreeOldSortOrder = g:NERDTreeSortOrder
     call self.sortChildren()
 
     call nerdtree#echo('')