From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: "Perry E. Metzger" Newsgroups: gmane.emacs.devel Subject: Re: slowness scrolling in *Help* windows Date: Mon, 8 Sep 2014 21:51:33 -0400 Message-ID: <20140908215133.3edec847@jabberwock.cb.piermont.com> References: <20140908130726.6d1c9e4a@jabberwock.cb.piermont.com> <87mwaa7zu0.fsf@igel.home> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Trace: ger.gmane.org 1410227521 19343 80.91.229.3 (9 Sep 2014 01:52:01 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 9 Sep 2014 01:52:01 +0000 (UTC) Cc: emacs-devel@gnu.org To: Andreas Schwab Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Tue Sep 09 03:51:54 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 1XRAb3-0002IR-9m for ged-emacs-devel@m.gmane.org; Tue, 09 Sep 2014 03:51:53 +0200 Original-Received: from localhost ([::1]:46524 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XRAb2-0005OA-UI for ged-emacs-devel@m.gmane.org; Mon, 08 Sep 2014 21:51:52 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:51875) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XRAap-0005Ns-LG for emacs-devel@gnu.org; Mon, 08 Sep 2014 21:51:40 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XRAan-0002lm-7y for emacs-devel@gnu.org; Mon, 08 Sep 2014 21:51:39 -0400 Original-Received: from hacklheber.piermont.com ([2001:470:30:84:e276:63ff:fe62:3400]:43134) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XRAan-0002ld-37 for emacs-devel@gnu.org; Mon, 08 Sep 2014 21:51:37 -0400 Original-Received: from snark.cb.piermont.com (localhost [127.0.0.1]) by hacklheber.piermont.com (Postfix) with ESMTP id 25A8F448; Mon, 8 Sep 2014 21:51:36 -0400 (EDT) Original-Received: from jabberwock.cb.piermont.com (jabberwock.cb.piermont.com [10.160.2.107]) by snark.cb.piermont.com (Postfix) with ESMTP id BE38F2DED23; Mon, 8 Sep 2014 21:51:35 -0400 (EDT) In-Reply-To: <87mwaa7zu0.fsf@igel.home> X-Mailer: Claws Mail 3.10.1 (GTK+ 2.24.24; x86_64-apple-darwin13.3.0) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 2001:470:30:84:e276:63ff:fe62:3400 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:174101 Archived-At: On Mon, 08 Sep 2014 20:05:11 +0200 Andreas Schwab wrote: > "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. I can believe that this is part of the problem, but it seems like it is anomalously long under the circumstances. It should not take seconds on a modern processor to perform this action. Perhaps something rather inefficient is going on, like a bad choice of a search algorithm? Perry -- Perry E. Metzger perry@piermont.com