From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7% Date: Sat, 11 Sep 2021 21:16:53 +0300 Message-ID: <835yv7gep6.fsf@gnu.org> References: <83a6kuyysv.fsf@gnu.org> <837dfwyird.fsf@gnu.org> <83tuj0ux6y.fsf@gnu.org> <83pmtouul2.fsf@gnu.org> <83k0jwus8w.fsf@gnu.org> <83k0jngtub.fsf@gnu.org> <837dfnghgi.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="40347"; mail-complaints-to="usenet@ciao.gmane.io" Cc: acm@muc.de, emacs-devel@gnu.org To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Sep 11 20:17:45 2021 Return-path: 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 ) id 1mP7ZQ-000AIn-Lx for ged-emacs-devel@m.gmane-mx.org; Sat, 11 Sep 2021 20:17:44 +0200 Original-Received: from localhost ([::1]:44598 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mP7ZP-0001IA-Ix for ged-emacs-devel@m.gmane-mx.org; Sat, 11 Sep 2021 14:17:43 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:43186) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mP7Yr-0000cR-NR for emacs-devel@gnu.org; Sat, 11 Sep 2021 14:17:09 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:39386) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mP7Yq-0006pL-IS; Sat, 11 Sep 2021 14:17:08 -0400 Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:4638 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mP7Yp-0002RX-Sf; Sat, 11 Sep 2021 14:17:08 -0400 In-Reply-To: (message from Stefan Monnier on Sat, 11 Sep 2021 14:00:57 -0400) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:274559 Archived-At: > From: Stefan Monnier > Cc: acm@muc.de, emacs-devel@gnu.org > Date: Sat, 11 Sep 2021 14:00:57 -0400 > > >> Maybe a good way to see the waste is to measure the time for the > >> initial font-lock in an outline-mode buffer where the screen is > >> filled with single-line headers and everything else is hidden: > >> a whole chunk will be fontified for each line, so with a single > >> 40-line screen you can expect to fontify 40 chunks (unless the > >> hidden text between lines is smaller than the chunk size, of > >> course). > > > > That's okay, but the thing is we do fontify invisible text, and 1500 > > characters could be easily 40 lines, so the probability of more than > > that to be hidden is not large, except in unusual cases like reading > > Lisp in Outline mode with all the code hidden. > > Where, your "unusual" is my default With all the code hidden? really? Why have that in Emacs at all, if you aren't editing its code?