diff --git a/modules/home-manager/shell.nix b/modules/home-manager/shell.nix
index 17f3f58..2efd4ac 100644
--- a/modules/home-manager/shell.nix
+++ b/modules/home-manager/shell.nix
@@ -8,8 +8,11 @@
     syntaxHighlighting.enable = true;
     oh-my-zsh = {
       enable = true;
-      # theme will be set below
+      # theme will be set below depending on the shell
       theme = "";
+      # make omz faster on large repositories
+      custom = "DISABLE_UNTRACKED_FILES_DIRTY=true";
+      # add git and agents as plugins
       plugins = [ "git" "ssh-agent" "gpg-agent" ];
     };
     # only display a fancy theme when glyphs are rendered