From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: GNU Emacs 24 Performance Issues in 'add-text-properties Date: Wed, 03 Sep 2014 22:45:28 -0400 Message-ID: References: <7a14bdfa-e253-440c-999c-1cccde9f5d52@googlegroups.com> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1409798776 22006 80.91.229.3 (4 Sep 2014 02:46:16 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 4 Sep 2014 02:46:16 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Sep 04 04:46:09 2014 Return-path: Envelope-to: geh-help-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 1XPN3o-0001kI-Ar for geh-help-gnu-emacs@m.gmane.org; Thu, 04 Sep 2014 04:46:08 +0200 Original-Received: from localhost ([::1]:48511 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XPN3n-0004uS-Pi for geh-help-gnu-emacs@m.gmane.org; Wed, 03 Sep 2014 22:46:07 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:43071) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XPN3X-0004uH-5Z for help-gnu-emacs@gnu.org; Wed, 03 Sep 2014 22:45:58 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XPN3P-0003ae-MO for help-gnu-emacs@gnu.org; Wed, 03 Sep 2014 22:45:51 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:56645) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XPN3P-0003aW-FQ for help-gnu-emacs@gnu.org; Wed, 03 Sep 2014 22:45:43 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1XPN3N-0001Ti-6E for help-gnu-emacs@gnu.org; Thu, 04 Sep 2014 04:45:41 +0200 Original-Received: from 69-165-145-6.dsl.teksavvy.com ([69.165.145.6]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 04 Sep 2014 04:45:41 +0200 Original-Received: from monnier by 69-165-145-6.dsl.teksavvy.com with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 04 Sep 2014 04:45:41 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 10 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 69-165-145-6.dsl.teksavvy.com User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux) Cancel-Lock: sha1:p97BWM4zTApvFPuLgbrJQkBM8ac= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:99632 Archived-At: > (add-text-properties (- startc 2) (- endc 0) '(face '(:foreground "gray"))) This call, like any other call that changes text-properties is considered as a buffer modification. So the modification hooks are run, which can include font-lock stuff (which will end up overwriting your `face' property, by the way) and other fun, which could end up being costly. Stefan