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#13675: 24.2.93; Extremely slow redisplay when lines are very long Date: Sun, 10 Feb 2013 19:36:30 +0200 Message-ID: <83pq085aw1.fsf@gnu.org> References: <83sj545e55.fsf@gnu.org> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1360517812 16019 80.91.229.3 (10 Feb 2013 17:36:52 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 10 Feb 2013 17:36:52 +0000 (UTC) Cc: 13675@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sun Feb 10 18:37:11 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 1U4apy-0003pQ-PT for geb-bug-gnu-emacs@m.gmane.org; Sun, 10 Feb 2013 18:37:10 +0100 Original-Received: from localhost ([::1]:54493 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1U4apf-00087D-Kf for geb-bug-gnu-emacs@m.gmane.org; Sun, 10 Feb 2013 12:36:51 -0500 Original-Received: from eggs.gnu.org ([208.118.235.92]:47662) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1U4apc-00086u-CP for bug-gnu-emacs@gnu.org; Sun, 10 Feb 2013 12:36:49 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1U4apb-0004We-4B for bug-gnu-emacs@gnu.org; Sun, 10 Feb 2013 12:36:48 -0500 Original-Received: from debbugs.gnu.org ([140.186.70.43]:43819) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1U4apb-0004Wa-0f for bug-gnu-emacs@gnu.org; Sun, 10 Feb 2013 12:36:47 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.72) (envelope-from ) id 1U4app-0008FD-UI for bug-gnu-emacs@gnu.org; Sun, 10 Feb 2013 12:37:01 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: debbugs-submit-bounces@debbugs.gnu.org Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 10 Feb 2013 17:37:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 13675 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 13675-submit@debbugs.gnu.org id=B13675.136051780831671 (code B ref 13675); Sun, 10 Feb 2013 17:37:01 +0000 Original-Received: (at 13675) by debbugs.gnu.org; 10 Feb 2013 17:36:48 +0000 Original-Received: from localhost ([127.0.0.1]:49283 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from ) id 1U4apb-0008Em-Ji for submit@debbugs.gnu.org; Sun, 10 Feb 2013 12:36:48 -0500 Original-Received: from mtaout23.012.net.il ([80.179.55.175]:43318) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from ) id 1U4apX-0008EY-Dr for 13675@debbugs.gnu.org; Sun, 10 Feb 2013 12:36:46 -0500 Original-Received: from conversion-daemon.a-mtaout23.012.net.il by a-mtaout23.012.net.il (HyperSendmail v2007.08) id <0MI000200M61X300@a-mtaout23.012.net.il> for 13675@debbugs.gnu.org; Sun, 10 Feb 2013 19:36:25 +0200 (IST) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by a-mtaout23.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0MI0002SYM8OSA60@a-mtaout23.012.net.il>; Sun, 10 Feb 2013 19:36:25 +0200 (IST) In-reply-to: <83sj545e55.fsf@gnu.org> X-012-Sender: halo1@inter.net.il X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.13 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.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:71018 Archived-At: > Date: Sun, 10 Feb 2013 18:26:14 +0200 > From: Eli Zaretskii > > This is a very long-standing deficiency of the Emacs display engine: > it is awfully slow in buffers with very long (thousands of characters) > lines. Specifically, many simple movement commands, scrolling, or > even typing "M-x" can take several seconds(!) to complete. > > A simple Awk script attached below can be used to generate such files. > > For the latest discussions of this and some data, see this thread: > > http://lists.gnu.org/archive/html/emacs-devel/2013-02/msg00135.html > > The solution for this bug should produce algorithmic changes in the > display engine and possibly also supporting changes in data structures > that would prevent such a terrible slow-down with long lines. > Ideally, redisplay of such buffers should not be much slower than > buffers with "normal" line length. Revision 111724 speeds up some of the redisplay operations by a factor of 3.