The 'savefold' #emacs package automatically records and restores your fold states across Emacs restarts. It supports outline, org, hideshow, treesit-fold, and markdown-mode, etc.:
https://github.com/jcfk/savefold.el
More information about code folding in Emacs:
https://www.jamescherti.com/emacs-the-definitive-guide-to-code-folding/
If you experience keyboard input latency in Emacs GTK builds, it is frequently caused by the GTK input method interface.
If you primarily type in standard ASCII/English or are already comfortable using Emacs's native input methods, set the environment variable:
export GTK_IM_MODULE=none
(This ensures that keyboard events are processed directly by Emacs, resulting in a responsive editing environment.)
kirigami.el, a unified method to fold and unfold text in Emacs: outline, outline-indent, org-mode, markdown-mode, gfm-mode, vdiff, hideshow, fold-this, ts-fold, treesit-fold, vimish-fold... - james...
Outline-indent: Indentation based Folding for Emacs (Supersedes legacy packages such as origami.el and yafolding.el) - jamescherti/outline-indent.el
