From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#56682: Fix the long lines font locking related slowdowns Date: Mon, 01 Aug 2022 15:04:13 +0300 Message-ID: <83tu6w2mrm.fsf@gnu.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> <2f7eeea3-6ba9-d2c2-1fb9-dd40d2de2002@yandex.ru> <8c7321f2f368e8dd096d@heytings.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="19167"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 56682@debbugs.gnu.org, monnier@iro.umontreal.ca, dgutov@yandex.ru To: Gregory Heytings Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Aug 01 14:06:09 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 1oIUBT-0004kN-4d for geb-bug-gnu-emacs@m.gmane-mx.org; 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Original-Received: from [87.69.77.57] (port=2032 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oIU9n-0001Na-Lv; Mon, 01 Aug 2022 08:04:24 -0400 In-Reply-To: <8c7321f2f368e8dd096d@heytings.org> (message from Gregory Heytings on Sun, 31 Jul 2022 22:50:23 +0000) 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:238415 Archived-At: > Date: Sun, 31 Jul 2022 22:50:23 +0000 > From: Gregory Heytings > cc: 56682@debbugs.gnu.org, Eli Zaretskii , > Stefan Monnier > > It is way better to wait a few seconds more while the file is being > opened than to wait before two basic motion commands when the file > is already opened. I don't think I agree. Having to wait for the initial display is pretty annoying. In fact, this was how the original font-lock worked: it was triggered by find-file, and would fontify the entire buffer before showing any of it. That led very quickly to the likes of lazy-lock and fast-lock, and was eventually fixed by jit-lock. Try visiting a very large file encoded in something of the ISO-2022 family, and you will see what I mean. It's an annoyance. I have jit-lock-stealth enabled because I don't like the initial wait, but don't want any subsequent waits, either. We also have the (little used, for some reason) jit-lock-defer feature: if you set jit-lock-defer-time to a large enough value, M-> followed by C-p will not be as slow as they are now, I think.