From: Phil Sainty <psainty@orcon.net.nz>
To: "Basil L. Contovounesios" <contovob@tcd.ie>,
"Andreas Röhler" <andreas.roehler@easy-emacs.de>
Cc: 44464@debbugs.gnu.org
Subject: bug#44464: 28.0.50; slow shell output
Date: Fri, 6 Nov 2020 02:54:17 +1300 [thread overview]
Message-ID: <eae849fb-be36-35b5-f01c-76accad04af8@orcon.net.nz> (raw)
In-Reply-To: <87lffgt6nh.fsf@tcd.ie>
On 5/11/20 11:55 pm, Basil L. Contovounesios wrote:
> Andreas Röhler <andreas.roehler@easy-emacs.de> writes:
>> When running
>> curl -L -H "Accept: text/html" http://dbpedia.org/resource/Earth
>> output stops at several times.
>
> Isn't this just because of long lines in the output?
> This is a well-known performance pitfall in Emacs.
I can reproduce the issue (in 27.1), and it seems to me that it's
all about that one paragraph of right-to-left text.
If I disable `bidi-display-reordering', I see no slow-downs.
Eli, I note that setting `bidi-paragraph-direction' in the buffer
(with bidi-display-reordering enabled) does not seem to have any
obvious effect. Setting it to `left-to-right', I still see
right-to-left movement through that portion of the text, and the
associated slowness. Is that expected?
I'll add that the line in question is not *especially* long
(2374 characters); however it does seem to be a significant factor,
as enabling longlines-mode eliminates the slowness around that text.
-Phil
next prev parent reply other threads:[~2020-11-05 13:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-05 10:47 bug#44464: 28.0.50; slow shell output Andreas Röhler
2020-11-05 10:55 ` Basil L. Contovounesios
2020-11-05 13:54 ` Phil Sainty [this message]
2020-11-05 14:22 ` Eli Zaretskii
2020-11-05 14:41 ` Basil L. Contovounesios
2020-11-05 15:54 ` Eli Zaretskii
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