GNU bug report logs - #64391
30.0.50; buffer narrowing slowdown regression in emacs 29

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Andrew Cohen <acohen <at> ust.hk>
Cc: 64391 <at> debbugs.gnu.org, gregory <at> heytings.org
Subject: bug#64391: 30.0.50; buffer narrowing slowdown regression in emacs 29
Date: Sat, 01 Jul 2023 11:09:01 +0300

> From: Andrew Cohen <acohen <at> ust.hk>
> Cc: 64391 <at> debbugs.gnu.org,  gregory <at> heytings.org
> Date: Sat, 01 Jul 2023 15:31:53 +0800
> 
> >>>>> "EZ" == Eli Zaretskii <eliz <at> gnu.org> writes:
> 
>     EZ> Can you show a profile of the processing that takes a long time?
> 
> Not exactly sure how to answer this. The test case just goes through the
> buffer narrowing and widening (without modifying the buffer).  This
> takes very little time. Then the following takes a very  long time:
> 
>       (goto-char (point-min))
>       (while (not (eobp))
>         (delete-char 1)
>         (forward-line))

I asked for the profile produce by "M-x profiler-start RET RET" for
this very long processing.  is it feasible to produce such a profile?

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