From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Fabrice Popineau <fabrice.popineau@gmail.com>
Cc: Alan Mackenzie <acm@muc.de>, Emacs developers <emacs-devel@gnu.org>
Subject: Re: Is Emacs buffer scroll/redisplay slow?
Date: Sun, 19 Jan 2020 17:20:53 -0500 [thread overview]
Message-ID: <jwv5zh7t7mk.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <CAFgFV9O48kD5+rV2NDgRe4qVLJ=czsLGhinHRnm-Wdyyy--Bgg@mail.gmail.com> (Fabrice Popineau's message of "Sun, 19 Jan 2020 15:24:19 +0100")
>> > .... scrolling through an elisp buffer: I started the timer by hand and
>> > scrolled down for 1000 lines ....
[...]
>> .... and it took 45s on Windows/WSL and 35s on Windows/native.
1000 lines divided by 45s is about 22 lines per second.
If you did that with `C-n` it suggests you're simply using a keyboard
repeat rate of about 20 repetitions-per-second and Emacs is just neither
fast nor slow. 35s on native suggests the keyboard repeat rate is
(surprisingly) different, more like 30 repetitions-per-second.
If Emacs is slow in such a test, you'll notice because it will stop
refreshing the display at times (hoping that skipping the redisplay time
will help it keep up with the repeat rate).
Stefan
next prev parent reply other threads:[~2020-01-19 22:20 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-19 9:34 Is Emacs buffer scroll/redisplay slow? Fabrice Popineau
2020-01-19 11:51 ` Alan Mackenzie
2020-01-19 14:24 ` Fabrice Popineau
2020-01-19 15:28 ` Eli Zaretskii
2020-01-19 15:34 ` Fabrice Popineau
2020-01-19 16:02 ` Eli Zaretskii
2020-01-19 17:15 ` Fabrice Popineau
2020-01-19 22:20 ` Stefan Monnier [this message]
2020-01-20 0:23 ` Fabrice Popineau
2020-01-20 13:20 ` Stefan Monnier
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