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: Sun, 31 Jul 2022 23:15:56 +0000 Message-ID: <8c7321f2f3ec1ef81af9@heytings.org> References: <837d46mjen.fsf@gnu.org> <8a3eaeef01be5bfaa5ef@heytings.org> <05388e8d8812bfa3695d@heytings.org> <83v8rf5894.fsf@gnu.org> <65cb7c73fd4a999cca00@heytings.org> <8c7321f2f3400a5db9be@heytings.org> <8c7321f2f388e5343475@heytings.org> <6ea376f6-d503-06d8-6d83-50c52b695394@yandex.ru> <8c7321f2f3ac52bfee4b@heytings.org> 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="12663"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 56682@debbugs.gnu.org, Eli Zaretskii , Dmitry Gutov To: Stefan Monnier Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Aug 01 01:16:14 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 1oIIAQ-0003As-AI for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 01 Aug 2022 01:16:14 +0200 Original-Received: from localhost ([::1]:38378 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oIIAP-0005iI-DC for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 31 Jul 2022 19:16:13 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:38958) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oIIAF-0005hs-G0 for bug-gnu-emacs@gnu.org; Sun, 31 Jul 2022 19:16:03 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:49069) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1oIIAF-0006qg-7U for bug-gnu-emacs@gnu.org; Sun, 31 Jul 2022 19:16:03 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1oIIAE-0000FB-AD for bug-gnu-emacs@gnu.org; Sun, 31 Jul 2022 19:16:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Gregory Heytings Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 31 Jul 2022 23:16:02 +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=B56682.1659309359926 (code B ref 56682); Sun, 31 Jul 2022 23:16:02 +0000 Original-Received: (at 56682) by debbugs.gnu.org; 31 Jul 2022 23:15:59 +0000 Original-Received: from localhost ([127.0.0.1]:38818 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oIIAB-0000Er-9v for submit@debbugs.gnu.org; Sun, 31 Jul 2022 19:15:59 -0400 Original-Received: from heytings.org ([95.142.160.155]:32938) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oIIA9-0000Ej-59 for 56682@debbugs.gnu.org; Sun, 31 Jul 2022 19:15:57 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=heytings.org; s=20220101; t=1659309356; bh=s+9M3g775tJD5WWyMJOENgw3fq0vJr5u8MeYNJlIy8A=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:From; b=lSRPhN2kkkvNoYVmy1ry/njKlbMFaOC7UIgOzF8D2PE0QgdW7MZREgFEBVqRylX21 lZk9a6z17fdEimjp4VzPH1uf/3id7F4WUpwcIIyopSCVMy9qsn5l2pqD4Ktha5uvS5 fIVIrDPeK8ubT+W2TNa6Daq63P/981v2tZSELqZzLhtL17niGqQI38JLo/tED+34F5 sgL7vICPHUghiSq3o1U1VAu40Zh1EVtDJfjqIEdonFEPblGD7lZnWtJEGolJ5jzqRJ RFTOjSrhgkvPixJDcwICa7GnHFU7q/r/xZWNINew3ripSN7V7GFzKItj9kNGbUtkeP 6021jKbW2yOUg== 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:238379 Archived-At: >> That's true, but with such big files, the initial scan is slow. So the >> scenario is simple: you open a big enough file, type M->, and C-p. >> M-> will be instantaneous, and C-p will take a while, because of >> syntax-ppss. > > Really? I'd expect that `M->` is slow because of `syntax-ppss` (called > by font-lock) and then `C-p` is instantaneous. > Yes, really. M-> is fast because syntax-ppss is called inside fontification-functions, which are evaluated in a small portion of the buffer (with locked narrowing). And C-p is slow because post-command-hook is (or rather was) not subjected to the same locked narrowing.