From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#15555: 24.3; Bidirectional display very slow with long lines Date: Tue, 08 Oct 2013 21:07:39 +0300 Message-ID: <8338obskk4.fsf@gnu.org> References: <83wqlo461e.fsf@gnu.org> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1381261499 29603 80.91.229.3 (8 Oct 2013 19:44:59 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 8 Oct 2013 19:44:59 +0000 (UTC) Cc: 15555@debbugs.gnu.org To: Jerome L Quinn Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Tue Oct 08 21:45:01 2013 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1VTdDI-0002EU-KL for geb-bug-gnu-emacs@m.gmane.org; Tue, 08 Oct 2013 21:45:00 +0200 Original-Received: from localhost ([::1]:38362 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VTbvX-0002bi-Tn for geb-bug-gnu-emacs@m.gmane.org; Tue, 08 Oct 2013 14:22:35 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:39268) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VTbhY-0000YE-9D for bug-gnu-emacs@gnu.org; Tue, 08 Oct 2013 14:08:14 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VTbhS-0000ou-Eh for bug-gnu-emacs@gnu.org; Tue, 08 Oct 2013 14:08:08 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:55429) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VTbhS-0000oq-Av for bug-gnu-emacs@gnu.org; Tue, 08 Oct 2013 14:08:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1VTbhR-0004jD-So for bug-gnu-emacs@gnu.org; Tue, 08 Oct 2013 14:08:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Tue, 08 Oct 2013 18:08:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 15555 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 15555-submit@debbugs.gnu.org id=B15555.138125566718155 (code B ref 15555); Tue, 08 Oct 2013 18:08:01 +0000 Original-Received: (at 15555) by debbugs.gnu.org; 8 Oct 2013 18:07:47 +0000 Original-Received: from localhost ([127.0.0.1]:35489 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1VTbhC-0004il-NT for submit@debbugs.gnu.org; Tue, 08 Oct 2013 14:07:46 -0400 Original-Received: from mtaout23.012.net.il ([80.179.55.175]:58431) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1VTbh9-0004ia-N1 for 15555@debbugs.gnu.org; Tue, 08 Oct 2013 14:07:45 -0400 Original-Received: from conversion-daemon.a-mtaout23.012.net.il by a-mtaout23.012.net.il (HyperSendmail v2007.08) id <0MUD003003N9XD00@a-mtaout23.012.net.il> for 15555@debbugs.gnu.org; Tue, 08 Oct 2013 21:07:42 +0300 (IDT) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by a-mtaout23.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0MUD0031K3OSVB40@a-mtaout23.012.net.il>; Tue, 08 Oct 2013 21:07:42 +0300 (IDT) In-reply-to: X-012-Sender: halo1@inter.net.il X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 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.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:79058 Archived-At: > Cc: 15555@debbugs.gnu.org > From: Jerome L Quinn > Date: Tue, 8 Oct 2013 11:39:58 -0400 > > I'm not sure it is the same bug. When I disable the bidi reordering > variable, > navigation speed becomes reasonable, even with the very long line length. > I'm on a very fast machine, so #13675 may not be impacting me that badly. > > When bidi reordering is enabled, it is multiple seconds to move the > cursor up and down, which is unusable. You are on a very fast machine, so you don't see the slow redisplay with such lines. But the basic problem remains: Emacs does not cope well with long lines. It's just that in your case the border of "unbearable" is farther. > Setting bidi-paragraph-direction to right-to-left improves the > situation some but I'd still call it unusable in this situation. > Disabling reordering makes emacs as responsive as I'd expect, > comparable to emacs23. Emacs 24 cannot possibly work as fast as Emacs 23, since reordering of bidirectional text does need a lot of additional processing. There's nothing that can be done about that, without a complete rewrite of the Emacs display engine (or purchasing a faster machine). > I don't see as bad behavior when the text is in the left buffer or > if I have only 1 window. Then don't do that. Again, these all are signs of slow redisplay with long lines. They just become a bot faster or slower in specific situations and screen arrangements. > And disabling bidi reordering completely eliminates the bad behavior. If you can afford that, go for it.