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: Thu, 04 Aug 2022 19:00:27 +0300 Message-ID: <83h72s2e3o.fsf@gnu.org> References: <837d46mjen.fsf@gnu.org> <8335esjppt.fsf@gnu.org> <837d43j198.fsf@gnu.org> <83y1wjhkkh.fsf@gnu.org> <83wnc3hkdg.fsf@gnu.org> <49df74e5-e16a-a532-98d1-66c6ff1eb6c6@yandex.ru> <83pmhuft5a.fsf@gnu.org> <05388e8d8836c2e7ef3e@heytings.org> <136c4fe0fcb9ce5181cb@heytings.org> <3d639ea12689d767ba2a@heytings.org> <838ro44fc8.fsf@gnu.org> <3d639ea126d759bddfea@heytings.org> <83y1w42vp4.fsf@gnu.org> <3d639ea12618e6a503af@heytings.org> <83wnbo2uw3.fsf@gnu.org> <3d639ea126e3a4d880b8@heytings.org> <83k07o2izh.fsf@gnu.org> <3d639ea1265c40a07f40@heytings.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="5774"; mail-complaints-to="usenet@ciao.gmane.io" Cc: gerd.moellmann@gmail.com, 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 Thu Aug 04 18:04:38 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 1oJdKv-0001AW-I5 for geb-bug-gnu-emacs@m.gmane-mx.org; 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Original-Received: from [87.69.77.57] (port=3495 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 1oJdGx-00020Y-8K; Thu, 04 Aug 2022 12:00:31 -0400 In-Reply-To: <3d639ea1265c40a07f40@heytings.org> (message from Gregory Heytings on Thu, 04 Aug 2022 15:08:07 +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:238762 Archived-At: > Date: Thu, 04 Aug 2022 15:08:07 +0000 > From: Gregory Heytings > cc: gerd.moellmann@gmail.com, 56682@debbugs.gnu.org, monnier@iro.umontreal.ca, > dgutov@yandex.ru > > For example C-p, C-n, C-v, M-v. C-f and C-b also, but much less so. > > For example, open the file and do M-g c 70000 RET. This took about 5 > seconds. Now do C-n, this again took about 5 seconds. With the > optimizations, M-g c 70000 RET is almost immediate, and C-n there takes > less than a second. I'm on the branch, so I am _after_ the optimizations. I thought you said even after that the navigation is sluggish. I see somewhat slower response than in "normal" files, but my build is unoptimized, so where it takes 3 or 4 seconds, and optimized build should be almost instantaneous. And that looks good enough to me, since being a bit slower in such files is IMO fine. > But you're right, this slowdown has little to do with bidi. A file with a > sufficiently long single line of Arabic text has the same problem. (But > not one with a line of Hebrew text.) OK. Text that goes through character compositions is expected to be slower in redisplay, because character composition in Emacs works by calling into Lisp. So I think we are good here, do you agree?