From: Eli Zaretskii <eliz@gnu.org>
To: Jerome L Quinn <jlquinn@us.ibm.com>
Cc: 15555@debbugs.gnu.org
Subject: bug#15555: 24.3; Bidirectional display very slow with long lines
Date: Tue, 08 Oct 2013 21:07:39 +0300 [thread overview]
Message-ID: <8338obskk4.fsf@gnu.org> (raw)
In-Reply-To: <OF2B55B1F5.54EA9C4F-ON85257BFE.0053238D-85257BFE.00560E73@us.ibm.com>
> Cc: 15555@debbugs.gnu.org
> From: Jerome L Quinn <jlquinn@us.ibm.com>
> Date: Tue, 8 Oct 2013 11:39:58 -0400
>
> I'm not sure it is the same bug. When I disable the bidi reordering
> variable,
> navigation speed becomes reasonable, even with the very long line length.
> I'm on a very fast machine, so #13675 may not be impacting me that badly.
>
> When bidi reordering is enabled, it is multiple seconds to move the
> cursor up and down, which is unusable.
You are on a very fast machine, so you don't see the slow redisplay
with such lines. But the basic problem remains: Emacs does not cope
well with long lines. It's just that in your case the border of
"unbearable" is farther.
> Setting bidi-paragraph-direction to right-to-left improves the
> situation some but I'd still call it unusable in this situation.
> Disabling reordering makes emacs as responsive as I'd expect,
> comparable to emacs23.
Emacs 24 cannot possibly work as fast as Emacs 23, since reordering of
bidirectional text does need a lot of additional processing. There's
nothing that can be done about that, without a complete rewrite of the
Emacs display engine (or purchasing a faster machine).
> I don't see as bad behavior when the text is in the left buffer or
> if I have only 1 window.
Then don't do that.
Again, these all are signs of slow redisplay with long lines. They
just become a bot faster or slower in specific situations and screen
arrangements.
> And disabling bidi reordering completely eliminates the bad behavior.
If you can afford that, go for it.
next prev parent reply other threads:[~2013-10-08 18:07 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-07 20:05 bug#15555: 24.3; Bidirectional display very slow with long lines Jerome L Quinn
2013-10-08 6:42 ` Eli Zaretskii
2013-10-08 15:39 ` Jerome L Quinn
2013-10-08 18:07 ` Eli Zaretskii [this message]
2013-10-09 12:26 ` Stefan Monnier
2013-10-09 16:59 ` Eli Zaretskii
2013-10-09 18:04 ` Jerome L Quinn
2016-01-26 5:13 ` bug#3219: " Andrew Hyatt
2016-01-26 14:41 ` Eli Zaretskii
2014-02-18 12:43 ` bug#15555: " Dmitry Antipov
2014-02-18 14:01 ` Dmitry Antipov
2014-02-18 16:21 ` Eli Zaretskii
2014-02-18 14:04 ` bug#15555: " Stefan Monnier
2014-02-18 14:31 ` Dmitry Antipov
2014-02-18 16:24 ` Eli Zaretskii
2014-02-18 17:34 ` Dmitry Antipov
2014-02-18 17:47 ` Eli Zaretskii
2014-02-19 17:43 ` Eli Zaretskii
2014-02-20 7:32 ` Dmitry Antipov
2014-02-20 17:45 ` Eli Zaretskii
2014-02-21 5:32 ` Dmitry Antipov
2014-02-18 17:58 ` Eli Zaretskii
2014-02-19 5:48 ` Dmitry Antipov
2014-02-19 17:36 ` Eli Zaretskii
2014-02-20 17:44 ` bug#15555: " Eli Zaretskii
2014-02-18 17:44 ` Eli Zaretskii
2014-02-18 17:42 ` Eli Zaretskii
2014-02-19 10:49 ` bug#15555: " Dmitry Antipov
2014-02-19 17:39 ` Eli Zaretskii
2014-02-20 7:21 ` Dmitry Antipov
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