Subject: Re: bug#72551: 28.2; slowness in global minor mode

From: Eli Zaretskii <[email-masked]>
Date: Sat, 17 Aug 2024 12:37:03 +0300

> Cc: [email-masked]
> Date: Sat, 10 Aug 2024 08:53:51 +0300
> From: Eli Zaretskii <[email-masked]>
> 
> > Date: Fri, 09 Aug 2024 18:57:54 +0000
> > From:  "Michael Grant" via "Bug reports for GNU Emacs,
> >  the Swiss army knife of text editors" <[email-masked]>
> > 
> > To reproduce:
> > 
> > emacs -Q --eval '
> > (progn (require (quote cl))
> >    (load "~/.emacs.d/elpa/yascroll-20220212.1742/yascroll-autoloads.el")
> >    (cl-loop repeat 100 collect (generate-new-buffer "Test"))
> >    (global-yascroll-bar-mode 1)
> >    (setq yascroll:delay-to-hide nil)
> >    (cl-loop for i below 200 do (insert (format "line %d\n" i)))
> >    (goto-char (point-min))
> >    (insert "\n\n --> Now type C-x C-b and see how long it takes! 
> > <--\n\n"))'
> > 
> > note, you need to have the yascroll package installed.  Your package
> > directory may vary.  This does not seem specific to yascroll, it's just 
> > easily
> > reproduced with yascroll.
> > 
> > The expected result is that it shows the buffer list nearly instantly.
> > The actual result is it takes several seconds!
> > 
> > It seems like something is looping over each buffer and calling
> > something on each buffer to see if yascroll needs to be enabled.
> > 
> > If a bugfix is not forthcoming, a workaround would be appreciated!
> 
> Yascroll is not part of Emacs, and there are several issues about
> slowdown on its GitHub site.  My suggestion is to take this up with
> yascroll's developers.
> 
> The first step towards finding the culprit and potential workarounds
> is to profile the slow operation with the Emacs Lisp profiler.

No further comments, so I presume this was reported to yascroll's
developers, and I'm therefore closing this bug.