From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" Newsgroups: gmane.emacs.bugs Subject: bug#56682: Fix the long lines font locking related slowdowns Date: Sat, 13 Aug 2022 09:37:06 -0400 Message-ID: References: <92da07bd028e3ede61a6@heytings.org> <47894c57-dd8b-5778-240a-3fa6540e4d37@yandex.ru> <92da07bd02941d5537e9@heytings.org> <5308e3b5-a160-17d7-77ee-b1d00acfa20d@yandex.ru> <92da07bd02a6cc861e1a@heytings.org> <837d3lzv8n.fsf@gnu.org> <2c8d6755-cfe2-6559-3fde-3fa30ffb411e@yandex.ru> <83mtcgy44k.fsf@gnu.org> <83k07jx5jn.fsf@gnu.org> <866e510d-a060-7daa-d002-97861d056fa7@yandex.ru> <1144021660321893@iva5-64778ce1ba26.qloud-c.yandex.net> <83y1vtmjld.fsf@gnu.org> <8868631660327773@iva2-775ff39c77bc.qloud-c.yandex.net> <83pmh4n0t8.fsf@gnu.org> Reply-To: Stefan Monnier Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="36436"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) Cc: 56682@debbugs.gnu.org, Gregory Heytings , dgutov@yandex.ru To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sat Aug 13 15:39:06 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 1oMrM1-0009GH-5f for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 13 Aug 2022 15:39:05 +0200 Original-Received: from localhost ([::1]:51756 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oMrM0-0007hy-5M for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 13 Aug 2022 09:39:04 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:35404) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oMrL1-0007AL-6Y for bug-gnu-emacs@gnu.org; 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Sat, 13 Aug 2022 09:37:07 -0400 (EDT) In-Reply-To: <83pmh4n0t8.fsf@gnu.org> (Eli Zaretskii's message of "Sat, 13 Aug 2022 08:56:51 +0300") 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:239543 Archived-At: > Is 20MB single-line JSON file fairly representative of such files out > there? Do we know of JSON file with much longer lines, for example > 50MB or 100MB? IIUC it's very common for JSON files to be made of a single line, so the line length is the file's length and since those files are machine-generated I don't expect 100MB to be much less common than 20MB. > If 20MB is reasonably representative of the long-line JSON, then > perhaps at least json-mode could consider resetting > long-line-threshold to nil. IIUC a nil value for `long-line-threshold` makes Emacs completely unusable with such long lines even if you disable all the bells and whistles. Dmitry's suggestion is to skip the locked-narrowing in some cases, but not to set `long-line-threshold` to nil. Stefan