From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Lars Ingebrigtsen Newsgroups: gmane.emacs.devel Subject: Re: Redisplay slower in Emacs 28 than Emacs 27 Date: Tue, 08 Dec 2020 02:21:54 +0100 Message-ID: <87y2i93xe5.fsf@gnus.org> References: <878sa9hbe2.fsf@gnus.org> <877dptfvae.fsf@gnus.org> <83czzl8qwu.fsf@gnu.org> <87sg8h78s8.fsf@gnus.org> <87h7ox71xc.fsf@gnus.org> <874kkx6zwj.fsf@gnus.org> <87zh2p5ksl.fsf@gnus.org> <87r1o15ifl.fsf@gnus.org> <87eek15gaf.fsf@gnus.org> <87a6up5eni.fsf@gnus.org> <87360h5dt4.fsf@gnus.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="20745"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: Eli Zaretskii , emacs-devel@gnu.org To: Gregory Heytings Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Tue Dec 08 02:22:54 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 1kmRiQ-0005IA-2r for ged-emacs-devel@m.gmane-mx.org; Tue, 08 Dec 2020 02:22:54 +0100 Original-Received: from localhost ([::1]:42002 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kmRiP-0008U9-5h for ged-emacs-devel@m.gmane-mx.org; Mon, 07 Dec 2020 20:22:53 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:42836) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kmRhd-00082a-JE for emacs-devel@gnu.org; Mon, 07 Dec 2020 20:22:05 -0500 Original-Received: from quimby.gnus.org ([2a01:4f9:2b:f0f::2]:34048) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kmRhZ-0006j1-Kx; Mon, 07 Dec 2020 20:22:05 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnus.org; s=20200322; h=Content-Type:MIME-Version:Message-ID:In-Reply-To:Date: References:Subject:Cc:To:From:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=yMvD8/O52mqRUs3ILNl6yfRPujr6WcTLbChPj12cv/Q=; b=DB3BtmkKui+wEXWRZYf1fuqdUt lswlYzN8ZsO/b++EkSS/WX9LM6DZN0jxX3/Krz49/VOXSA7gHcyoGqietYuOeXxJu/msAOLbEi28s XrMoIIHOtrR/ZbAt8LBpqs6SmF1GPMjapOtnZJAT00EdYjzq6pki6CwDRV6hvGeCpy0w=; Original-Received: from cm-84.212.202.86.getinternet.no ([84.212.202.86] helo=xo) by quimby.gnus.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kmRhT-00042s-MB; Tue, 08 Dec 2020 02:21:58 +0100 Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwBAMAAAClLOS0AAAABGdBTUEAALGPC/xhBQAAACBj SFJNAAB6JgAAgIQAAPoAAACA6AAAdTAAAOpgAAA6mAAAF3CculE8AAAAElBMVEUVIRAzUjp2mlbo +u2lx6v///8CDjcGAAAAAWJLR0QF+G/pxwAAAAd0SU1FB+QMCAEUA/cg2gIAAAGfSURBVDjLdZOL jcMwCIYh6gCAOkBMvcDVGeDieP+ZDuzEdqscUhQpH68fCEA1ZiZ79JUug27s4PBvb3/BTLRU53f+ iEDR2MAmA6Dl6SAdH8AiSkrfxZEJ/gE8QJzbRRwgfOoAbSoq2NLw7xEbp7S/hjwDx/a0Xg1s6wDe le6i+bVhyhqnGqIrWnexyLGrTCMxLVznEktgnABLIANBWYmnTD53yyeBhTXMhPxhjDur5RuZcvA6 2abpG9Dh7wGyGAAj1JzbyzJo2r3Q1RNK1tX9j81k2wh8Cf5dRbcdSuacogFkYHKBWKIlkWKzPfZc nbkmQ6lSSY63iWiAujCzJf34TZwNTSN5pNWP7lmUL9/mIRkryMfvU/QS8SBYQgVlj6sNFLSLXLiB XAi85bEoqofNIQbfNPcemGqE/xB9UA20AMZzIj1X+zxS25hVg+/pDGCgfh6qV37L0kVbANmSL7M1 nhGL5RlgKurTGMAu8uoAu4Bmi5Ws54M8NVt/alUC+FJRhccMtwDiOoFRhpZIdxGmUOEmoh4k3ETQ OM2vGqfmP1IpTEYmiGEdAAAAJXRFWHRkYXRlOmNyZWF0ZQAyMDIwLTEyLTA4VDAxOjIwOjAzKzAw OjAw2k6+0wAAACV0RVh0ZGF0ZTptb2RpZnkAMjAyMC0xMi0wOFQwMToyMDowMyswMDowMKsTBm8A AAAASUVORK5CYII= X-Now-Playing: The Notwist's _Ship_: "Ship" In-Reply-To: <87360h5dt4.fsf@gnus.org> (Lars Ingebrigtsen's message of "Tue, 08 Dec 2020 01:41:59 +0100") Received-SPF: pass client-ip=2a01:4f9:2b:f0f::2; envelope-from=larsi@gnus.org; helo=quimby.gnus.org X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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:260543 Archived-At: Lars Ingebrigtsen writes: > Anyway, this has reminded me of something I've wondered about before: > Why doesn't `create-image' stick a :hash element into the spec so that > redisplay doesn't have to recompute it all the time? Especially with > large datap images, not having to recompute the hash when redisplaying > must surely be a big win... On the other hand, since we're doing the comparison with EQ, it makes little sense to compute the hash with a function that takes string contents into consideration. So we would make a much simpler and faster hash function for the image cache that just looks at object identity (and number values) and not anything else. -- (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no