bug#53606: 29.0.50; Very slow Customize buffer for bibtex-biblatex-entry-alist

[Eli Zaretskii]

> Date: Sun, 10 Sep 2023 06:49:29 -0300
> Cc: 53606@debbugs.gnu.org
> From: Mauro Aranda <maurooaranda@gmail.com>
> 
> On 10/9/23 02:01, Eli Zaretskii wrote:
>  > Could you please profile this slow operation and post the completely
>  > unfolded profile?  I think we should try to understand what exactly
>  > takes so much time in this case.
> 
> Here it is.  I also attach the result of C-x C-w in the report buffer,
> just in case.

So the hot spot seems to be widget-checklist-add-item, is that right?
And inside that widget-create-child and widget-apply?