From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: Redisplay slower in Emacs 28 than Emacs 27 Date: Tue, 08 Dec 2020 20:03:31 +0200 Message-ID: <83tusw5g5o.fsf@gnu.org> References: <877dptiro7.fsf@gnus.org> <87pn3lhcdd.fsf@gnus.org> <878sa9hbe2.fsf@gnus.org> <877dptfvae.fsf@gnus.org> <83czzl8qwu.fsf@gnu.org> <87sg8h78s8.fsf@gnus.org> <837dpt8lk5.fsf@gnu.org> <87pn3kjssr.fsf@gnus.org> <83im9c70vu.fsf@gnu.org> <87im9cfeej.fsf@gnus.org> <837dps6xyv.fsf@gnu.org> <87czzkdx57.fsf@gnus.org> <83v9dc5he3.fsf@gnu.org> <87r1o0chk9.fsf@gnus.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="37777"; mail-complaints-to="usenet@ciao.gmane.io" Cc: ghe@sdf.org, emacs-devel@gnu.org To: Lars Ingebrigtsen Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Tue Dec 08 19:28:36 2020 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kmhj1-0009ik-FY for ged-emacs-devel@m.gmane-mx.org; Tue, 08 Dec 2020 19:28:35 +0100 Original-Received: from localhost ([::1]:59134 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kmhj0-0006zL-GG for ged-emacs-devel@m.gmane-mx.org; Tue, 08 Dec 2020 13:28:34 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:57694) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kmhKv-0001Xq-Sp for emacs-devel@gnu.org; Tue, 08 Dec 2020 13:03:41 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:55676) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kmhKt-0006at-Bl; Tue, 08 Dec 2020 13:03:39 -0500 Original-Received: from [176.228.60.248] (port=3166 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1kmhKs-0008R5-Jk; Tue, 08 Dec 2020 13:03:39 -0500 In-Reply-To: <87r1o0chk9.fsf@gnus.org> (message from Lars Ingebrigtsen on Tue, 08 Dec 2020 18:51:18 +0100) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 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-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:260577 Archived-At: > From: Lars Ingebrigtsen > Cc: ghe@sdf.org, emacs-devel@gnu.org > Date: Tue, 08 Dec 2020 18:51:18 +0100 > > Eli Zaretskii writes: > > > It may make redisplay faster, but it will produce confusing effects if > > an identical spec is constructed from the same or identical elements: > > Emacs will think the image is not in the cache. Sounds like a lot to > > pay for a minor speedup, to say nothing of backward compatibility. > > It's a major speedup for :data images, which is what you'll find in eww > and mail readers. > > And we've been using equal_lists in Emacs 28, which is incompatible in > much the same way, and we've seen only one thing that needed tweaking > because of that. Emacs 28 is still quite young. Bottom line: I don't like such a change.