From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Andreas Schwab Newsgroups: gmane.emacs.devel Subject: Re: slowness scrolling in *Help* windows Date: Mon, 08 Sep 2014 20:05:11 +0200 Message-ID: <87mwaa7zu0.fsf@igel.home> References: <20140908130726.6d1c9e4a@jabberwock.cb.piermont.com> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1410199537 13800 80.91.229.3 (8 Sep 2014 18:05:37 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 8 Sep 2014 18:05:37 +0000 (UTC) Cc: emacs-devel@gnu.org To: "Perry E. Metzger" Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Mon Sep 08 20:05:30 2014 Return-path: Envelope-to: ged-emacs-devel@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 1XR3Jh-0003yy-R9 for ged-emacs-devel@m.gmane.org; Mon, 08 Sep 2014 20:05:29 +0200 Original-Received: from localhost ([::1]:44993 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XR3Jh-0000a2-Ds for ged-emacs-devel@m.gmane.org; Mon, 08 Sep 2014 14:05:29 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:38425) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XR3Ja-0000UU-DP for emacs-devel@gnu.org; Mon, 08 Sep 2014 14:05:27 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XR3JV-00028F-MI for emacs-devel@gnu.org; Mon, 08 Sep 2014 14:05:22 -0400 Original-Received: from mail-out.m-online.net ([2001:a60:0:28:0:1:25:1]:34396) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XR3JV-00024Z-Fn for emacs-devel@gnu.org; Mon, 08 Sep 2014 14:05:17 -0400 Original-Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 3hsHTP1jm9z3hjHL; Mon, 8 Sep 2014 20:05:13 +0200 (CEST) Original-Received: from localhost (dynscan1.mnet-online.de [192.168.6.68]) by mail.m-online.net (Postfix) with ESMTP id 3hsHTN6YWTzvh27; Mon, 8 Sep 2014 20:05:12 +0200 (CEST) X-Virus-Scanned: amavisd-new at mnet-online.de Original-Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.68]) (amavisd-new, port 10024) with ESMTP id 3bU5ZxSj9nQQ; Mon, 8 Sep 2014 20:05:11 +0200 (CEST) X-Auth-Info: +v7S5n/Y8kWTFOiUU6My9l353esAm7ioCsUXxVfqd+bUyPEWnUt9tlo3XLW2KJPb Original-Received: from igel.home (ppp-188-174-153-177.dynamic.mnet-online.de [188.174.153.177]) by mail.mnet-online.de (Postfix) with ESMTPA; Mon, 8 Sep 2014 20:05:11 +0200 (CEST) Original-Received: by igel.home (Postfix, from userid 1000) id 719F72C1D0D; Mon, 8 Sep 2014 20:05:11 +0200 (CEST) X-Yow: I always have fun because I'm out of my mind!!! In-Reply-To: <20140908130726.6d1c9e4a@jabberwock.cb.piermont.com> (Perry E. Metzger's message of "Mon, 8 Sep 2014 13:07:26 -0400") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.93 (gnu/linux) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 2001:a60:0:28:0:1:25:1 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:174094 Archived-At: "Perry E. Metzger" writes: > I've been noticing that sometimes scrolling in *Help* gets very, very > slow sometimes. Typical case: C-h s (that is, view the syntax table), > and scroll through it, and it can take seconds for the screen to do > something after C-v Emacs needs to look up the fonts for the characters in the buffer. That can take some time depending on the number of installed fonts. > It is possible this is only happening if there are loads of "unusual" > Unicode characters in the buffer in question. I don't have any good > very long files of lots of Unicode characters to check if it is > happening on all buffers, or just *Help* buffers. It happens for any buffer that contains many different characters from unusual scripts. Try scrolling through the buffer generated by mule-diag for an extreme example. Andreas. -- Andreas Schwab, schwab@linux-m68k.org GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5 "And now for something completely different."