From mboxrd@z Thu Jan  1 00:00:00 1970
Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail
From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%
Date: Sun, 12 Sep 2021 20:55:41 +0300
Message-ID: <831r5tfzky.fsf@gnu.org>
References: <jwvy28gyq7r.fsf-monnier+emacs@gnu.org> <837dfwyird.fsf@gnu.org>
 <YTOHorezJ5Lz+S/o@ACM> <jwvk0jwie0b.fsf-monnier+emacs@gnu.org>
 <YTORqWPX9lEyOBZ9@ACM> <jwvv93ggwrv.fsf-monnier+emacs@gnu.org>
 <83tuj0ux6y.fsf@gnu.org> <jwv1r64gv14.fsf-monnier+emacs@gnu.org>
 <83pmtouul2.fsf@gnu.org> <jwvczpofd7s.fsf-monnier+emacs@gnu.org>
 <83k0jwus8w.fsf@gnu.org> <jwv7dfwfaq0.fsf-monnier+emacs@gnu.org>
 <83k0jngtub.fsf@gnu.org> <jwvo88zhwps.fsf-monnier+emacs@gnu.org>
 <837dfnghgi.fsf@gnu.org> <jwv1r5vxacs.fsf-monnier+emacs@gnu.org>
 <835yv7gep6.fsf@gnu.org> <jwvpmtex51r.fsf-monnier+emacs@gnu.org>
 <83wnnmfo3j.fsf@gnu.org> <jwvwnnlvjbl.fsf-monnier+emacs@gnu.org>
 <834kapg2g9.fsf@gnu.org> <jwvfsu9vglm.fsf-monnier+emacs@gnu.org>
Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214";
	logging-data="29583"; mail-complaints-to="usenet@ciao.gmane.io"
Cc: acm@muc.de, emacs-devel@gnu.org
To: Stefan Monnier <monnier@iro.umontreal.ca>
Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sun Sep 12 19:56:40 2021
Return-path: <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>
Envelope-to: ged-emacs-devel@m.gmane-mx.org
Original-Received: from lists.gnu.org ([209.51.188.17])
	by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
	(Exim 4.92)
	(envelope-from <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>)
	id 1mPTia-0007T9-1a
	for ged-emacs-devel@m.gmane-mx.org; Sun, 12 Sep 2021 19:56:40 +0200
Original-Received: from localhost ([::1]:42850 helo=lists1p.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.90_1)
	(envelope-from <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>)
	id 1mPTiX-0004Wd-M9
	for ged-emacs-devel@m.gmane-mx.org; Sun, 12 Sep 2021 13:56:37 -0400
Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:54038)
 by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <eliz@gnu.org>) id 1mPThq-00036r-HC
 for emacs-devel@gnu.org; Sun, 12 Sep 2021 13:55:54 -0400
Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:36282)
 by eggs.gnu.org with esmtp (Exim 4.90_1)
 (envelope-from <eliz@gnu.org>)
 id 1mPThp-0005mB-4p; Sun, 12 Sep 2021 13:55:53 -0400
Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:1398
 helo=home-c4e4a596f7)
 by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <eliz@gnu.org>)
 id 1mPTho-00072z-OL; Sun, 12 Sep 2021 13:55:53 -0400
In-Reply-To: <jwvfsu9vglm.fsf-monnier+emacs@gnu.org> (message from Stefan
 Monnier on Sun, 12 Sep 2021 13:41:05 -0400)
X-BeenThere: emacs-devel@gnu.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: "Emacs development discussions." <emacs-devel.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/emacs-devel>,
 <mailto:emacs-devel-request@gnu.org?subject=unsubscribe>
List-Archive: <https://lists.gnu.org/archive/html/emacs-devel>
List-Post: <mailto:emacs-devel@gnu.org>
List-Help: <mailto:emacs-devel-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/emacs-devel>,
 <mailto:emacs-devel-request@gnu.org?subject=subscribe>
Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org
Original-Sender: "Emacs-devel"
 <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>
Xref: news.gmane.io gmane.emacs.devel:274605
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/274605>

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: acm@muc.de,  emacs-devel@gnu.org
> Date: Sun, 12 Sep 2021 13:41:05 -0400
> 
> > Yes, of course.  Which is why I think that having the entire code
> > hidden is a rare phenomenon, even in your sessions.  Because once you
> > visit a file, you usually reveal the code, in order to work on it.
> 
> Right, but the big gain is right when I open the file, where jit-lock
> only fontifies a handful of chunks even though often both point-min and
> point-max are visible.

I think the gain is illusory, because as soon as you unhide the code,
we start fontifying everything as usual.  IOW, hiding text is for this
purpose the same as simply leaving it off-screen.