Eli Zaretskii <eliz@gnu.org> writes:

How long is the post-command-hook list in your production sessions?
Should we poll users to give their data? Just yesterday someone
complained on Reddit that Emacs is too slow, and I have no doubt that
features that use post-command-hook are at least part of the reason if
not the reason.

this is what i have in every prog mode:

(eldoc-schedule-timer
treesit-fold-indicators–post-command
jit-lock–antiblink-post-command
fill-indicator–set-warning
indent-bars–highlight-current-depth
goggles–post-command
corfu–auto-post-command
yas–post-command-handler
whitespace-post-command-hook
t
eldoc-box–follow-cursor)

Most of these functions uses this hook for run code when cursor changes
position since there is not a hook for that (yet).

I think there should be a entry in etc/TODO for hooks when:

• buffer content changes
  
• cursor changes position
  
• undo (and redo) commands are used.
  
• rendering/displaying frame content (thus the code would not run for every function).
  

This would reduce post-command-hook usage and help Emacs ecosystem a lot.