Org files lead to sluggish behavior

[lake-effect]

Symptoms

I'm sorry I don't have much concrete info as to why, but here's what I know so far:

• Org files upwards of around 1000 lines get very sluggish
• "Sluggish" means slow input response. It can be as bad as multiple seconds before inputs are reflected in the display
• It doesn't seem to strongly depend on line length, it might also be depth but even 3 levels is enough
• Some files fail to open at all (too slow? Emacs hang)
• Disabling org-bullets doesn't help

Environment

Org file modes

Enabled minor modes: Async-Bytecomp-Package Auto-Composition
Auto-Compression Auto-Encryption Cl-Old-Struct-Compat Company
Dumb-Jump Ede Electric-Indent File-Name-Shadow Font-Lock
Global-Auto-Revert Global-Company Global-Ede Global-Eldoc
Global-Font-Lock Global-Git-Commit Global-Linum
Global-Semantic-Idle-Scheduler Global-Semantic-Stickyfunc
Global-Semanticdb Global-Undo-Tree Helm Line-Number Linum
Magit-Auto-Revert Mouse-Wheel Org-Bullets Override-Global Projectile
Pyvenv Recentf Semantic Shell-Dirtrack Show-Paren Tooltip
Transient-Mark Undo-Tree Which-Key Yas Yas-Global

init.el

;;; package --- Main init file
;;; Commentary:
;;; This is my init file

;;; Code:


;; Added by Package.el.  This must come before configurations of
;; installed packages.  Don't delete this line.  If you don't want it,
;; just comment it out by adding a semicolon to the start of the line.
;; You may delete these explanatory comments.
;; (package-initialize)

(add-to-list 'load-path (concat user-emacs-directory "elisp"))

;; Set default font
(set-face-attribute 'default nil
                    :family "Monkey"
                    :height 120
                    :weight 'normal
                    :width 'normal)

(require 'base)
(require 'base-theme)
(require 'base-extensions)
(require 'base-functions)
(require 'base-global-keys)

(require 'lang-python)

(require 'lang-ruby)

(require 'lang-go)

(require 'lang-javascript)

(require 'lang-web)

(require 'lang-rust)

(require 'lang-c)

(blink-cursor-mode 0)
(put 'scroll-left 'disabled nil)

; Cut shell CRs from bash or something
(add-hook 'comint-output-filter-functions
          'comint-strip-ctrl-m)

(setq company-idle-delay 0.5)
(setq company-tooltip-idle-delay 0.5)

(require 'projectile)
(define-key projectile-mode-map (kbd "C-c C-p") 'projectile-command-map)
(define-key projectile-mode-map (kbd "C-c p") 'projectile-command-map)

(require 'helm)
(global-set-key (kbd "M-y") 'helm-show-kill-ring)
(global-set-key (kbd "C-s") 'helm-swoop)

(require 'browse-at-remote)
(global-set-key (kbd "C-c g") 'browse-at-remote)

(require 'magit-gh-pulls)
(add-hook 'magit-mode-hook 'turn-on-magit-gh-pulls)

(server-start)

(version)

GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30, cairo version 1.15.10) of 2020-09-19

[lake-effect]

Seems similar to #30. I'll try and profile there.