From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Gregory Heytings Newsgroups: gmane.emacs.bugs Subject: bug#56682: Fix the long lines font locking related slowdowns Date: Fri, 05 Aug 2022 14:09:30 +0000 Message-ID: <92da07bd02a6cc861e1a@heytings.org> References: <8c7321f2f388e5343475@heytings.org> <8c7321f2f36494299e61@heytings.org> <8c7321f2f336523624e3@heytings.org> <83r1202meh.fsf@gnu.org> <6020ffaf-9069-0070-76cf-a13379ef01b5@yandex.ru> <83les71ilg.fsf@gnu.org> <06c5560d-3009-e5a5-3d33-fe5d2ec32d6b@yandex.ru> <74ddc877f17a06d8f120@heytings.org> <100d08b3-c25b-683f-6def-39052107ab59@yandex.ru> <83h72r16g1.fsf@gnu.org> <640c2e07-98e1-96d6-bb02-19f5f03f637f@yandex.ru> <834jyq29o1.fsf@gnu.org> <92da07bd028e3ede61a6@heytings.org> <47894c57-dd8b-5778-240a-3fa6540e4d37@yandex.ru> <92da07bd02941d5537e9@heytings.org> <5308e3b5-a160-17d7-77ee-b1d00acfa20d@yandex.ru> Mime-Version: 1.0 Content-Type: text/plain; format=flowed; charset=us-ascii Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="8630"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 56682@debbugs.gnu.org, Eli Zaretskii , Stefan Monnier To: Dmitry Gutov Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Fri Aug 05 16:10:38 2022 Return-path: Envelope-to: geb-bug-gnu-emacs@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 1oJy2A-00021o-EP for geb-bug-gnu-emacs@m.gmane-mx.org; Fri, 05 Aug 2022 16:10:38 +0200 Original-Received: from localhost ([::1]:47818 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oJy28-0007EL-RB for geb-bug-gnu-emacs@m.gmane-mx.org; Fri, 05 Aug 2022 10:10:36 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:43974) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oJy1a-0007ED-9Q for bug-gnu-emacs@gnu.org; Fri, 05 Aug 2022 10:10:03 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:42200) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1oJy1Z-0003si-Ua for bug-gnu-emacs@gnu.org; Fri, 05 Aug 2022 10:10:01 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1oJy1Z-0003h2-Li for bug-gnu-emacs@gnu.org; Fri, 05 Aug 2022 10:10:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Gregory Heytings Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Fri, 05 Aug 2022 14:10:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 56682 X-GNU-PR-Package: emacs Original-Received: via spool by 56682-submit@debbugs.gnu.org id=B56682.165970857514157 (code B ref 56682); Fri, 05 Aug 2022 14:10:01 +0000 Original-Received: (at 56682) by debbugs.gnu.org; 5 Aug 2022 14:09:35 +0000 Original-Received: from localhost ([127.0.0.1]:60182 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oJy19-0003gF-AJ for submit@debbugs.gnu.org; Fri, 05 Aug 2022 10:09:35 -0400 Original-Received: from heytings.org ([95.142.160.155]:40574) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oJy16-0003g6-4Y for 56682@debbugs.gnu.org; Fri, 05 Aug 2022 10:09:34 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=heytings.org; s=20220101; t=1659708571; bh=WirIpVJO19S3reoLJ6dOhJgj6/kqF+V2jc8Dd6NOEA4=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:From; b=b8cOHl+YQfBt5P6C3tBNEr+tB7/1zXPzY9hxfD3eAA8KChROCJN0ay4/Og0xHWV3Q 9v6c1LGkxUYPrnLqHoeB1JiDnHjEfUUkoWZHpYcQULgpfuXkfl5jaCf9613/Uch0g+ hCbhd+F8qp1VJ+0HrmAs9E8qA2AYQ2BuRujDqK/LBB3HM8lyXx0E03wFELh8tHS+X/ LhClNSLT2raqDmuhfRGxYhUFW/yaT5pgBauIEbtkdE4+akoiIpwKNLsQsbeGkvq9DL JhSUZHejie5sOWMBahLfKvNLK+OpfoJAr7uigjYSZPRefzlg9F8FTQr+zMX2cfStui UK8MjOE9SDDGA== In-Reply-To: <5308e3b5-a160-17d7-77ee-b1d00acfa20d@yandex.ru> X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:238921 Archived-At: >> But if you're so annoyed by mis-fontification, why don't you just turn >> font-lock mode off? > > "If you're annoyed by Emacs's performance with large files, why don't > you just never open them?" > That's just wrong: in one case we're talking about your personal feelings/preferences, in the other one about Emacs' capabilities for all its users. > > I like font-lock and the visual cues that come with it. Only > font-locking the first 1 MB of a large file seems like a good > compromise: show correct highlighting where we can with reasonable > performance, and omit it in the rest of the file. > So what you prefer IIUC would be to call fontification-functions with a locked narrowing to 1 MB if point is before that threshold, and to not call fontification-functions at all after that threshold? That might be another doable approach. >> Also, why did you not protest vehemently when Stefan added >> syntax-wholeline-max, which also causes occasional mis-fontification? > > I have replied to this exact question in an earlier email. We can > continue this line of inquiry in that subthread. > Sorry, I missed that part of your earlier post: > > syntax-wholelines-max indeed can potentially cause problems too, but in > a much narrow range of situations (and only with major modes which have > non-trivial syntax-propertize-function). > You forget to metion that syntax-wholelines-max can in fact make things much worse, see the recipes I sent you a few days ago. So it doesn't seem like it's the right approach.