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: Mon, 20 Jan 2020 08:20:41 -0500 [thread overview]
Message-ID: <jwvzheis1yu.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <CAFgFV9MjgCTvk25H4E+z3onebCaHjKzt-OpX+OaFzXEO4cykJw@mail.gmail.com> (Fabrice Popineau's message of "Mon, 20 Jan 2020 01:23:22 +0100")
>> 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).
> If I posted this, it is because looking at it, the cursor was like
> jumping from line to line, but it doesn't seem steady. Actually,
> I changed some setting to get a faster autorepeat and emacs keeps up
> when the time is down to 16s for 1000 lines, more than twice as fast.
Ah, now you're talking!
Then yes, we have a speed problem. Usually this depends on the
minor&major modes involved, so the profile is the best way to
start digging. Could you try and redo the profile run, but where you
maximize the proportion of "line scrolling" that takes place during the
time between `profiler-start` and `profiler-report`?
Stefan
prev parent reply other threads:[~2020-01-20 13:20 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
2020-01-20 0:23 ` Fabrice Popineau
2020-01-20 13:20 ` Stefan Monnier [this message]
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