Re: Some performance questions.

[Eli Zaretskii]

> Date: Wed, 08 Feb 2023 22:09:36 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: emacs-devel@gnu.org
> 
> > 71 45% Automatic GC
> > 68 43% redisplay_internal
> >          jit-lock-function
> >              ...
> >              font-lock-fontify-keywords-region
> > 
> > 37 23%          c-font-lock-declarations
> > 20 12%          c-font-lock-cut-off-declarators
> > 
> > I have not observed such lags before on GNU/Linux, so some idea what I
> > may be doing wrong?
> > 
> > I know Eli uses MS-Windows frequently, so, any hint?
> 
> Try using c-ts-mode instead (assuming this is Emacs 29 and it was
> built with tree-sitter).

And if you cannot use tree-sitter, then try this:

  (setq jit-lock-stealth-time 16)
  (setq jit-lock-defer-contextually t)
  (setq jit-lock-stealth-load 20)