From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#28795: 25.2; UTF-8 language environment causes extreme sluggishness Date: Thu, 12 Oct 2017 12:31:22 +0300 Message-ID: <83infkn251.fsf@gnu.org> References: <86376oiv5i.fsf@60hz.org> Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1507800836 11149 195.159.176.226 (12 Oct 2017 09:33:56 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 12 Oct 2017 09:33:56 +0000 (UTC) Cc: 28795@debbugs.gnu.org To: Mark Laws Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Thu Oct 12 11:33:49 2017 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e2Zs5-00011d-3S for geb-bug-gnu-emacs@m.gmane.org; Thu, 12 Oct 2017 11:33:41 +0200 Original-Received: from localhost ([::1]:44454 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e2ZsC-00050o-Ij for geb-bug-gnu-emacs@m.gmane.org; Thu, 12 Oct 2017 05:33:48 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:54192) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e2ZqY-00048Y-KL for bug-gnu-emacs@gnu.org; Thu, 12 Oct 2017 05:32:07 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1e2ZqV-000893-FY for bug-gnu-emacs@gnu.org; Thu, 12 Oct 2017 05:32:06 -0400 Original-Received: from debbugs.gnu.org ([208.118.235.43]:54420) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1e2ZqV-00088u-6U for bug-gnu-emacs@gnu.org; Thu, 12 Oct 2017 05:32:03 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1e2ZqU-0007pZ-Sw for bug-gnu-emacs@gnu.org; Thu, 12 Oct 2017 05:32:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 12 Oct 2017 09:32:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 28795 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 28795-submit@debbugs.gnu.org id=B28795.150780070530062 (code B ref 28795); Thu, 12 Oct 2017 09:32:02 +0000 Original-Received: (at 28795) by debbugs.gnu.org; 12 Oct 2017 09:31:45 +0000 Original-Received: from localhost ([127.0.0.1]:34867 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e2ZqD-0007oo-5J for submit@debbugs.gnu.org; Thu, 12 Oct 2017 05:31:45 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:34639) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e2ZqB-0007oc-A2 for 28795@debbugs.gnu.org; Thu, 12 Oct 2017 05:31:44 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1e2Zq3-0007me-0c for 28795@debbugs.gnu.org; Thu, 12 Oct 2017 05:31:38 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:39721) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e2Zq2-0007mW-Sg; Thu, 12 Oct 2017 05:31:34 -0400 Original-Received: from [176.228.60.248] (port=1564 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1e2Zq1-0003qn-7U; Thu, 12 Oct 2017 05:31:34 -0400 In-reply-to: <86376oiv5i.fsf@60hz.org> (message from Mark Laws on Thu, 12 Oct 2017 18:15:53 +0900) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 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" Xref: news.gmane.org gmane.emacs.bugs:138256 Archived-At: > From: Mark Laws > Date: Thu, 12 Oct 2017 18:15:53 +0900 > > M-x set-language-environment UTF-8 On Windows, doing this is a mistake (but not because it causes sluggish redisplay). > M-: (insert #x2207) > > Then hold down C-o until you have a bunch of empty lines, and start moving > around the buffer with the usual movement keys. You will notice it is very, > very slow. Then delete the character from the buffer, and notice how things are > fast again. I cannot reproduce this here. What font is used to display that character? You can find this out with "C-u C-x =" with the cursor on the character. On my system, I have the Symbola font installed, which is used for displaying this character, and the problem doesn't happen. As another thing to try, set inhibit-compacting-font-caches to a non-nil value, and see if that helps.