From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Andrey Orst Newsgroups: gmane.emacs.bugs Subject: bug#46350: 28.0.50; touchpad-scrolling-eats-lots-of-cpu-samples Date: Mon, 8 Feb 2021 17:35:51 +0300 Message-ID: References: <838s81nhoz.fsf@gnu.org> <8335y9neut.fsf@gnu.org> <83h7mnn4y6.fsf@gnu.org> <83czxbn2dy.fsf@gnu.org> Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="000000000000daee1405bad416f3" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="18165"; mail-complaints-to="usenet@ciao.gmane.io" To: Alan Third , Andrey Orst , Eli Zaretskii , 46350@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Feb 08 21:52:48 2021 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 1l9DWa-0004eA-DV for geb-bug-gnu-emacs@m.gmane-mx.org; 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charset="UTF-8" And horizontal scrolling is not laggy with touchpad at all. Well, at least rapid left and right swipes on touchpad aren't creating enormous cpu usage. So, to summarize: - scrolling to buffer end (down) is less laggy than scrolling to buffer start (up) - horizontal scrolling isn't laggy at all - this can be achieved with mouse if you roll it with mouse wheel over the table very fast If I can produce more information, maybe stack traces, or more in-depth profiling please guide me with some instructions. This issue bothered me for about 2 years, just finally decided to report it. --000000000000daee1405bad416f3 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
And horizontal scrolling is not laggy with touchpad at al= l. Well, at least rapid left and right swipes on touchpad aren't creati= ng enormous cpu usage.

So, to = summarize:

- scrolling t= o buffer end=C2=A0 (down) is less laggy than scrolling to buffer start (up)=
- horizontal scrolling isn't laggy at all
=
- this can be achieved with mouse if you roll it with mou= se wheel over the table very fast

If I can produce more information, maybe stack traces, or more in= -depth profiling please guide me with some instructions. This issue bothere= d me for about 2 years, just finally decided to report it.
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