From: Eli Zaretskii <eliz@gnu.org>
To: Lawrence Mitchell <wence@gmx.li>
Cc: 11943@debbugs.gnu.org
Subject: bug#11943: 24.1.50; Emacs unusably slow when looking at large files (bidi support at fault)
Date: Sun, 15 Jul 2012 17:51:15 +0300 [thread overview]
Message-ID: <83hat9axi4.fsf@gnu.org> (raw)
In-Reply-To: <87fw8tqlra.fsf@gmx.li>
> From: Lawrence Mitchell <wence@gmx.li>
> Date: Sun, 15 Jul 2012 12:58:17 +0100
>
> This appears to be an issue with buffers that have no strongly
> R2L or L2R characters near point-min.
More accurately, it was an issue with _paragraphs_ that have no strong
directional characters.
> C-x b *tmp* RET
> M-x fundamental-mode RET
> M-: (dotimes (i 100000) (insert "1\n")) RET
> M-<
>
> next-line now has a noticeable delay (especially when holding
> down next-line, display doesn't update the cursor position).
>
> Now insert an 'a' somewhere near the beginning of the buffer,
> display updates appear instantaneous again. If we instead go to
> the end of the buffer and insert an 'a', no such change in the
> response occurs.
However, if you insert "a\n\n" at the beginning, the slowdown comes
back again. Which is to say that the problem is not with what we have
at point-min, but what we have in the paragraph around point. The
fact that setting bidi-paragraph-direction to a non-nil value makes
the problem go away is another telltale sign of that.
Anyway, it's solved now.
Thanks.
prev parent reply other threads:[~2012-07-15 14:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-15 0:50 bug#11943: 24.1.50; Emacs unusably slow when looking at large files (bidi support at fault) Dima Kogan
2012-07-15 3:04 ` Eli Zaretskii
2012-07-15 3:31 ` Dima Kogan
2012-07-15 14:47 ` Eli Zaretskii
2012-07-15 11:58 ` Lawrence Mitchell
2012-07-15 14:51 ` Eli Zaretskii [this message]
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