From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Doug Davis Newsgroups: gmane.emacs.bugs Subject: bug#42834: 28.0.50; macOS scroll and movement latency slows when display changes Date: Wed, 12 Aug 2020 17:48:47 -0400 Message-ID: References: <20200812212407.GA42658@breton.holly.idiocy.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="13333"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: mu4e 1.4.10; emacs 28.0.50 Cc: 42834@debbugs.gnu.org To: Alan Third Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Thu Aug 13 01:00:15 2020 Return-path: Envelope-to: geb-bug-gnu-emacs@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 1k5zjA-0003MW-OE for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 13 Aug 2020 01:00:13 +0200 Original-Received: from localhost ([::1]:55498 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1k5zj9-0006sj-9f for geb-bug-gnu-emacs@m.gmane-mx.org; 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Wed, 12 Aug 2020 17:48:52 -0400 (EDT) In-reply-to: <20200812212407.GA42658@breton.holly.idiocy.org> X-Mailman-Approved-At: Wed, 12 Aug 2020 18:59:47 -0400 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:184898 Archived-At: Hi Alan, Alan Third writes: > On Wed, Aug 12, 2020 at 02:48:08PM -0400, Doug Davis wrote: >> I'm observing this behavior on a MacBook Pro running macOS 10.15 >> >> initial condition: laptop is closed and plugged into an external display >> over thunderbolt; I start and use Emacs with expected performance. After >> unplugging the external display and opening the laptop to use by itself, >> Emacs (which was already running) cursor movement and scrolling latency >> shoots up (Emacs is just very "sluggish"). If I restart Emacs everything >> goes back to normal. I'm observing the same behavior with 'emacs -Q'. I >> don't see the same behavior from Emacs 27.1. > > Hi, Thanks for your report, I haven't seen this myself. > > Do you see the same thing going the other way? (laptop screen -> monitor) Ah yes, forgot to mention that- seeing it both ways. > Is your monitor a retina screen? Yeah the MacBook is retina and the external display is 4k. > NS xwidgets were just added today, did you see this before? (or have > you just tried Emacs 28 for the first time today?) After seeing the new xwidgets patches that went in today I recompiled the master branch to experiment a bit, but I first hit this issue a couple of months ago when I first experimented with Emacs 28- I should have reported the bug earlier, sorry about that (xwidgets actually brought me back to playing with 28 after staying with 27 recently). Cheers, Doug