diff --git a/README.md b/README.md
index 3a40e55..2784b25 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@ Since `.vue` is a combination of CSS, HTML and JavaScript, so is `vim-vue-plugin
 
 Supports
 
-- Vue attribute(directive).
+- Vue attribute(directive).^
 - Less/Sass/Scss, Pug with [vim-pug][4], Coffee with [vim-coffee-script][11], TypeScript with [typescript-vim][14] or [yats.vim][15], Stylus with [vim-stylus][16].^
 - A builtin `foldexpr` foldmethod.^
 - [emmet-vim][10] HTML/CSS/JavaScript filetype detection.
@@ -72,11 +72,13 @@ let g:vim_vue_plugin_load_full_syntax = 1
 | `g:vim_vue_plugin_has_init_indent`    | Initially indent one tab inside `style/script` tags.                                                   | 0+ |
 | `g:vim_vue_plugin_highlight_vue_attr` | Highlight vue attribute value as expression instead of string.                                         | 0 |
 | `g:vim_vue_plugin_highlight_vue_keyword` | Highlight vue keyword like `data`, `methods`, ...                       | 0 |
-| `g:vim_vue_plugin_use_foldexpr`       | Enable builtin `foldexpr` foldmethod.                                                                  | 0 |
+| `g:vim_vue_plugin_use_foldexpr`\#     | Enable builtin `foldexpr` foldmethod.                                                                  | 0 |
 | `g:vim_vue_plugin_debug`              | Echo debug messages in `messages` list. Useful to debug if unexpected indents occur.                   | 0 |
 
 \*: Vim may be slow if the feature is enabled. Find a balance between syntax highlight and speed. By the way, custom syntax can be added in `~/.vim/syntax` or `$VIM/vimfiles/syntax`. 
 
+\#: In the case when it's enabled, the `foldexpr` is not efficient for large files, so it's not enabled initially when the line number exceeds `1000`. You can enable it mannully by `setlocal foldmethod=expr` when required.
+
 \+: 0 for `.vue` and 1 for `.wpy`
 
 **Note**
diff --git a/ftplugin/vue/fold.vim b/ftplugin/vue/fold.vim
index e7ff36f..24a48fe 100644
--- a/ftplugin/vue/fold.vim
+++ b/ftplugin/vue/fold.vim
@@ -13,7 +13,9 @@ if !s:use_foldexpr | finish | endif
 " Settings {{{
 "
 """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
-setlocal foldmethod=expr
+if line('$') < 1000
+  setlocal foldmethod=expr
+endif
 setlocal foldexpr=GetVueFold(v:lnum)
 "}}}