From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#39133: 28.0.50; Emacs slowdown on special char Date: Tue, 14 Jan 2020 17:26:45 +0200 Message-ID: <83lfqa5aa2.fsf@gnu.org> References: Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="241694"; mail-complaints-to="usenet@blaine.gmane.org" Cc: 39133@debbugs.gnu.org To: Evgeny Zajcev Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Jan 14 16:38:46 2020 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1irOHF-0010DT-Jl for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 14 Jan 2020 16:38:45 +0100 Original-Received: from localhost ([::1]:42314 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1irOHE-0000Ue-9y for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 14 Jan 2020 10:38:44 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:41923) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1irO5z-0002VP-KY for bug-gnu-emacs@gnu.org; Tue, 14 Jan 2020 10:27:08 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1irO5u-0003Wt-QU for bug-gnu-emacs@gnu.org; Tue, 14 Jan 2020 10:27:07 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:55670) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1irO5u-0003WP-MT for bug-gnu-emacs@gnu.org; Tue, 14 Jan 2020 10:27:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1irO5u-0004VT-Iu for bug-gnu-emacs@gnu.org; Tue, 14 Jan 2020 10:27:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Tue, 14 Jan 2020 15:27:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 39133 X-GNU-PR-Package: emacs Original-Received: via spool by 39133-submit@debbugs.gnu.org id=B39133.157901560517293 (code B ref 39133); Tue, 14 Jan 2020 15:27:02 +0000 Original-Received: (at 39133) by debbugs.gnu.org; 14 Jan 2020 15:26:45 +0000 Original-Received: from localhost ([127.0.0.1]:33410 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1irO5c-0004Uq-UL for submit@debbugs.gnu.org; Tue, 14 Jan 2020 10:26:45 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:32776) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1irO5a-0004Ua-NY for 39133@debbugs.gnu.org; Tue, 14 Jan 2020 10:26:43 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:47308) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1irO5V-0002t4-2B; Tue, 14 Jan 2020 10:26:37 -0500 Original-Received: from [176.228.60.248] (port=4191 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1irO5T-0006gH-Us; Tue, 14 Jan 2020 10:26:36 -0500 In-reply-to: (message from Evgeny Zajcev on Tue, 14 Jan 2020 16:21:23 +0300) 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: 209.51.188.43 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-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:174568 Archived-At: > From: Evgeny Zajcev > Date: Tue, 14 Jan 2020 16:21:23 +0300 > > I'm experiencing extreme Emacs slowdown when VARIATION SELECTOR-16 char > is used somewhere in Emacs buffer. For example, I just executed: > > (insert "a\xfe0f") > > in *scratch* buffer. Moving cursor (when this char is visible) become > unbearable. Here is the results of cpu profiling: > > - command-execute 776 62% > - call-interactively 776 62% > - funcall-interactively 675 54% > - previous-line 476 38% > - line-move 476 38% > - line-move-1 476 38% > + vertical-motion 225 18% Does it help to set inhibit-compacting-font-caches non-nil? > As I remember I did not experienced something similar in Emacs 26/27 I don't think Emacs < 27 supported variation selectors, did it?