From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7% Date: Sat, 11 Sep 2021 13:04:31 -0400 Message-ID: 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> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="33148"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: acm@muc.de, emacs-devel@gnu.org To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Sep 11 19:14:10 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 1mP6Zs-0008NQ-JM for ged-emacs-devel@m.gmane-mx.org; Sat, 11 Sep 2021 19:14:08 +0200 Original-Received: from localhost ([::1]:52744 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mP6Zr-0001My-Am for ged-emacs-devel@m.gmane-mx.org; Sat, 11 Sep 2021 13:14:07 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:33832) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mP6Qh-0007mZ-9R for emacs-devel@gnu.org; Sat, 11 Sep 2021 13:04:40 -0400 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:9900) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mP6Qe-00006N-Pg; Sat, 11 Sep 2021 13:04:38 -0400 Original-Received: from pmg2.iro.umontreal.ca (localhost.localdomain [127.0.0.1]) by pmg2.iro.umontreal.ca (Proxmox) with ESMTP id 1D49480926; Sat, 11 Sep 2021 13:04:40 -0400 (EDT) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg2.iro.umontreal.ca (Proxmox) with ESMTP id AFD1D806C6; Sat, 11 Sep 2021 13:04:38 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1631379878; bh=VwiYiUkX/KGN7XbfIA427e1HBTU4LiZhcixooezQK/4=; h=From:To:Cc:Subject:References:Date:In-Reply-To:From; b=QTMGfagZAnr0ojkqqC1sw6UxCWYjkAxinSRuK0P+wwSLCOUnEHsCgSaJg38emJ4l4 2SCUXl4Vuo11ofcVvMAe8NC2laQWmf1BhfBNzbE8FKw60+F1G07GBPUEhh/Zly8HWh z/heac5bWKO5+OcVdrKiiGpuVii2zqtIm0rpFqihzF9ykOSd3wF2dV2aUQ83Qs8nGJ XbeFiuLlQyhNt/Krd5FTNBX4hi9wKpTnkhYG+ScqsjJNPZbQU0rQa4oQ5K+sDYKf+U 3Xt61UcJFCtyBh8bDaHl/oye9E14h0gfajUrsoBE9kXpbsCLlhrv6nZReqVY0MnJhw 5vU9Togsfkwkg== Original-Received: from ceviche (unknown [45.72.241.23]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 96C2B1202AF; Sat, 11 Sep 2021 13:04:32 -0400 (EDT) In-Reply-To: <83k0jngtub.fsf@gnu.org> (Eli Zaretskii's message of "Sat, 11 Sep 2021 15:49:48 +0300") Received-SPF: pass client-ip=132.204.25.50; envelope-from=monnier@iro.umontreal.ca; helo=mailscanner.iro.umontreal.ca X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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:274554 Archived-At: >> and it will probably say nil. > That's sheer luck: it happens only when the invisible text between > headings is longer than jit-lock-chunk-size. That was exactly the case I was talking about. That's why I wrote a few messages ago: 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). -- Stefan