Re: Slow redisplay

[Eli Zaretskii <eliz@gnu.org>]

> Date: Mon, 26 Aug 2019 06:20:41 +0200
> From: Ergus <spacibba@aol.com>
> Cc: help-gnu-emacs@gnu.org
> 
> >If you set garbage-collection-messages non-nil, do you see any GC
> >messages when Emacs is lagging input?
> 
> No there is not any garbage collection message after 5 hours.
> 
> >If so, does invoking "M-x
> >garbage-collect RET" manual fix that?
> >
> Yes, executing it manually fixes the lagging.
> 
> In my config I do.
> 
> early-init.el
> =============
> 
> (setq file-name-handler-alist nil
>       message-log-max 16384
>       gc-cons-threshold most-positive-fixnum   ;; Defer Garbage collection
>       gc-cons-percentage 1.0)
> 
> (add-hook 'window-setup-hook
>           (lambda ()
>             (setq file-name-handler-alist file-name-handler-alist-old
>                   gc-cons-threshold 800000
>                   gc-cons-percentage 0.1)
> 	    (garbage-collect)
> 	    (message "Load time %.06f" (float-time (time-since my/start-time))))
> 	  t)
> 
> init.el
> =======
> 
> (defun my/minibuffer-setup-hook ()
>   (setq gc-cons-threshold most-positive-fixnum))
> 
> (defun my/minibuffer-exit-hook ()
>   (setq gc-cons-threshold 800000))
> 
> (add-hook 'minibuffer-setup-hook #'my/minibuffer-setup-hook)
> (add-hook 'minibuffer-exit-hook #'my/minibuffer-exit-hook)
> 
> ================

There's currently an unfixed bug on master, whereby you must call
garbage-collect explicitly when you reset gc-cons-threshold to a value
lower than most-positive-fixnum.  Otherwise GC remains disabled
basically forever.