GNU bug report logs - #58342
29.0.50; noverlay branch is O(N) for important calls

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From: Matt Armstrong <matt <at> rfc20.org>
To: Drew Adams <drew.adams <at> oracle.com>, Stefan Monnier <monnier <at> iro.umontreal.ca>, Eli Zaretskii <eliz <at> gnu.org>
Cc: "gerd.moellmann <at> gmail.com" <gerd.moellmann <at> gmail.com>, "mail <at> andreas-politz.de" <mail <at> andreas-politz.de>, "58342 <at> debbugs.gnu.org" <58342 <at> debbugs.gnu.org>
Subject: bug#58342: 29.0.50; noverlay branch is O(N) for important calls
Date: Sat, 08 Oct 2022 16:08:36 -0700

Drew Adams <drew.adams <at> oracle.com> writes:

>> For the potential performance problem with next-overlay-change to appear
>> you need overlays to overlap, so not something like linum or nhexl-mode.
>
> Which is why I mentioned zones.el.
>
> And I don't expect it to be alone in this.
> Overlays can be anywhere.

For what it is worth, the use cases where this bug applies are likely to
be noticeably slow in Emacs today as well.

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