diff --git a/settings/gui-settings.el b/settings/gui-settings.el
index 766df218..6204ee80 100644
--- a/settings/gui-settings.el
+++ b/settings/gui-settings.el
@@ -391,14 +391,17 @@ See also `dashboard-insert-section' for the sequence of elements."
   ;; activate `dashboard'
   (dashboard-setup-startup-hook))
 
+;; too slow if all levels are displayed for a medium large file,
+;; therefore not all levels and if toggled on and mode default off
 (use-package indent-guide
   :delight (indent-guide-mode "Ig")  ;; "\u24BE\uFF47"
-  :hook (prog-mode . indent-guide-mode)  ;; problem if used in notmuch
+  ;;:hook (prog-mode . indent-guide-mode)  ;; problem if used in notmuch
   :config
   (set-face-attribute 'indent-guide-face nil :foreground "DarkSlateGray")  ;; foreground #535353
   ;;(setq indent-guide-char ":")
   (setq indent-guide-char "\u2502")
-  (setq indent-guide-recursive t)  ;; NOT RECOMMENDED: To show not only one guide line but all guide lines recursively, set indent-guide-recursive non-nil.
+  (setq indent-guide-recursive nil)  ;; NOT RECOMMENDED: To show not only one guide line but all guide lines recursively, set indent-guide-recursive non-nil.
+    ;; `nil`: only single level, `t`: all levels
   )
 
 ;; problem when using 'character in elisp it inserts the guide characters when inserting text before guide characters