From: Ivan Shmakov <ivan@siamics.net>
To: 18778@debbugs.gnu.org
Subject: bug#18778: noticeable slowdown for buffers with long lines, word-wrap, and brackets
Date: Mon, 20 Oct 2014 19:17:28 +0000 [thread overview]
Message-ID: <87wq7ur1o7.fsf@violet.siamics.net> (raw)
In-Reply-To: <834mv55quj.fsf@gnu.org> (Eli Zaretskii's message of "Wed, 15 Oct 2014 17:51:00 +0300")
Package: emacs
X-Debbugs-Cc: Eli Zaretskii <eliz@gnu.org>
>>>>> Eli Zaretskii <eliz@gnu.org> writes:
[…]
> In addition, one of the new UBA features, the so-called Bidirectional
> Parentheses Algorithm (BPA), affects pure-ASCII text as well, and
> specifically editing of program sources (which widely use parentheses
> and brackets of several kinds).
> The result is some small slowdown -- a few percents in my testing --
> in redisplay operations. If more significant slowdown will be
> reported in some special cases, I will try to find optimizations to
> countermand that.
It seems that I’ve just found such a case for 13a3ad6b39c0.
To reproduce:
• create a buffer with long lines (see below for the example
I’ve used), and (setq word-wrap t line-move-visual nil) there;
• now, enclose every line in [, ] brackets (as in: M-x
replace-regexp RET .* RET [\&] RET; parentheses or curly
braces also exhibit the issue.)
For the resulting buffer, operations like (next-line) or even
(recenter) now result in a noticeable delay.
The issue doesn’t appear when word-wrap is not used, or when
there’s no brackets in the buffer. Neither the issue appears in
Emacs built 2014-10-09 from a then-recent Git clone.
I’ve used the output of the following Shell command as a test.
$ head -n 8192 < /usr/share/dict/american-english | fmt -w 1024
[…]
--
FSF associate member #7257 http://boycottsystemd.org/ … 3013 B6A0 230E 334A
next prev parent reply other threads:[~2014-10-20 19:17 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-15 14:51 Bidi reordering engine upgraded Eli Zaretskii
2014-10-15 15:22 ` Dmitry Antipov
2014-10-15 15:47 ` Eli Zaretskii
2014-10-15 16:00 ` Dmitry Antipov
2014-10-15 16:31 ` Eli Zaretskii
2014-10-15 17:28 ` Eli Zaretskii
2014-10-15 17:50 ` Eli Zaretskii
2014-10-16 3:55 ` Dmitry Antipov
2014-10-16 7:21 ` Eli Zaretskii
2014-10-16 9:42 ` Thien-Thi Nguyen
2014-10-16 10:15 ` Eli Zaretskii
2014-10-16 13:27 ` Thien-Thi Nguyen
2014-10-16 13:51 ` Eli Zaretskii
2014-10-17 5:42 ` Thien-Thi Nguyen
2014-10-17 6:16 ` Eli Zaretskii
2014-10-17 7:50 ` Thien-Thi Nguyen
2014-10-17 8:25 ` Eli Zaretskii
2014-10-17 10:27 ` Thien-Thi Nguyen
2014-10-17 10:31 ` Eli Zaretskii
2014-10-16 9:51 ` Dmitry Antipov
2014-10-16 10:20 ` Eli Zaretskii
2014-10-16 11:28 ` Eli Zaretskii
2014-10-17 6:46 ` Eli Zaretskii
2014-10-17 17:45 ` Jan Djärv
2014-10-17 18:45 ` Eli Zaretskii
2014-10-17 19:32 ` Stefan Monnier
2014-10-18 12:34 ` Jan Djärv
2014-10-18 12:54 ` Eli Zaretskii
2014-10-18 13:13 ` Eli Zaretskii
2014-10-19 11:45 ` Jan Djärv
2014-10-19 13:19 ` Eli Zaretskii
2014-10-19 11:49 ` Jan Djärv
2014-10-19 13:20 ` Eli Zaretskii
2014-10-20 19:17 ` Ivan Shmakov [this message]
2014-10-20 19:33 ` bug#18778: noticeable slowdown for buffers with long lines, word-wrap, and brackets Eli Zaretskii
2014-10-20 19:51 ` Ivan Shmakov
2014-10-22 16:12 ` Eli Zaretskii
2014-10-22 17:07 ` Ivan Shmakov
2014-10-29 19:31 ` Ivan Shmakov
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