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: Wed, 10 Aug 2022 09:04:06 +0000 Message-ID: References: <83v8rc2n1h.fsf@gnu.org> <64084296-1953-8ef8-5938-adfb6fb9b43f@yandex.ru> <83r11uzs8n.fsf@gnu.org> <14845631-c2ef-8371-8606-c858092e3192@yandex.ru> <83mtcizov2.fsf@gnu.org> <83h72qzheq.fsf@gnu.org> <25717d84-3411-a93a-3620-e04fe0571aff@yandex.ru> <83edxuzemr.fsf@gnu.org> <83a68hzz0a.fsf@gnu.org> <6ae35c93062c589b2e02@heytings.org> <7b7fbad7-55ac-49b8-840f-7f89a7e8771a@yandex.ru> <6ae35c93064b3588974c@heytings.org> <6ae35c9306c515f420d8@heytings.org> <87k07gwkjq.fsf@gmx.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="27909"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 56682@debbugs.gnu.org, Eli Zaretskii , monnier@iro.umontreal.ca, Dmitry Gutov To: Stephen Berman Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Wed Aug 10 11:06:02 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 1oLhf7-00072d-VU for geb-bug-gnu-emacs@m.gmane-mx.org; Wed, 10 Aug 2022 11:06:02 +0200 Original-Received: from localhost ([::1]:59570 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oLhf6-0008Co-HC for geb-bug-gnu-emacs@m.gmane-mx.org; Wed, 10 Aug 2022 05:06:00 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:49874) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oLheB-0008CU-FA for bug-gnu-emacs@gnu.org; Wed, 10 Aug 2022 05:05:03 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:56292) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1oLheA-0007Rz-34 for bug-gnu-emacs@gnu.org; Wed, 10 Aug 2022 05:05:03 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1oLhe9-00005T-UW for bug-gnu-emacs@gnu.org; Wed, 10 Aug 2022 05:05:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Gregory Heytings Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 10 Aug 2022 09:05:01 +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=B56682.166012225132724 (code B ref 56682); Wed, 10 Aug 2022 09:05:01 +0000 Original-Received: (at 56682) by debbugs.gnu.org; 10 Aug 2022 09:04:11 +0000 Original-Received: from localhost ([127.0.0.1]:46039 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oLhdL-0008Vj-An for submit@debbugs.gnu.org; Wed, 10 Aug 2022 05:04:11 -0400 Original-Received: from heytings.org ([95.142.160.155]:46930) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oLhdH-0008Va-CV for 56682@debbugs.gnu.org; Wed, 10 Aug 2022 05:04:07 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=heytings.org; s=20220101; t=1660122246; bh=bGpbOKw0TeciS34DExHe2X7Yq7DIFHkl/4qNmciVOLY=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:From; b=C5v1Er3wBGD8hAZUHYDWyNrPnAoRie0o3DNnn7X+6wxxfZ1QDhBoeXWYqv7oZscj3 W/3BxIVbPRwzPKhxDM2T/LTXGh9q4okOrXl4VjAwnC2+Um2BJKO5aN69Nmzo9EE1nm rbDG3DpXFFid0gX0laazNUeHkuI5B2vDzYeY15RqUGJ0IadpuY+IPMsiiK5AIQgYhQ FP2cNbSBb8KZ9xMwEJ9/gWLrbrw2wvKzbc0WhRM2wGLoUSADRyhpeNJIQOBkqyNzMU iBol3XlKnW9tO4U+JllnQfshYvB3TKLJPQIgEN3s8mO4usI98QEn/zcUtu86xH/+dg CSBW76PBUM8OA== In-Reply-To: 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:239256 Archived-At: >> When I visit addons.json (from my Firefox directory), which is a single >> line of (only) 19540 characters, and type `C-n' and hold down both >> keys, the cursor stops moving almost immediately (on the third visual >> line) and after letting go of the keys and waiting several seconds, >> point jumps down the buffer to its actual position; likewise with >> `C-p'. This is on master with -Q, and is no different from Emacs 28 >> (the only difference I notice is that in master the buffer is wrongly >> fontified from position 8235 to the end, while in 28 the entire buffer >> is correctly fontified). Is this expected? (When I enable >> so-long-mode in the buffer, holding down `C-n' or `C-p' produces no >> delay, both in master and 28.) > > That's not expected, no, and rather surprising because it would > contradict what we've seen so far. Can you post that file somewhere? > The only possible reason I can see ATM is that the file contains Arabic > characters, which are (and will remain) slow. > I forgot to mention: did you try after disabling show-paren-mode? It is known to slow down redisplay at the beginning and end of the buffer, and will eventually be automatically turned off in these buffers.