Re: Run `M-x list-input-methods` and then scroll down the screen in input method panel using the mouse or arrow key will cause Emacs unresponsive for about 1 minite.

[Hongyi Zhao <hongyi.zhao@gmail.com>]

On Sat, Jun 19, 2021 at 7:00 PM Eli Zaretskii <eliz@gnu.org> wrote:
>
> > Date: Sat, 19 Jun 2021 13:55:51 +0300
> > From: Eli Zaretskii <eliz@gnu.org>
> > Cc: emacs-devel@gnu.org
> >
> > The fast version is an optimized build, the slow one is unoptimized.
> > That explains at least part of the slowness.  The fast version also
> > doesn't include any text-shaping engine, which might speed up Emacs,
> > but prevents it from correctly displaying complex scripts.
> >
> > What are the Emacs versions of the two builds?
>
> Sorry, I see now that its Emacs 26.3 and 28.
>
> And I guess the Emacs 28 build also used the default optimization
> options, unlike what I said before.

Could you please provide me with the optimization options applicable
to Emacs 28, so that I can give it a try?

>
> So the only difference I see is the text-shaping engine that is
> missing in the "fast" version.  I don't think I understand why that
> should have such a profound effect on the speed of finding fonts,
> sorry.

HY
-- 
Assoc. Prof. Hongyi Zhao <hongyi.zhao@gmail.com>
Theory and Simulation of Materials
Hebei Vocational University of Technology and Engineering
NO. 552 North Gangtie Road, Xingtai, China