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From: Eli Zaretskii <eliz@gnu.org>
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Subject: 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.
Date: Sat, 19 Jun 2021 17:28:18 +0300
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Cc: emacs-devel@gnu.org
To: Hongyi Zhao <hongyi.zhao@gmail.com>
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 (message from Hongyi Zhao on Sat, 19 Jun 2021 22:19:16 +0800)
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> From: Hongyi Zhao <hongyi.zhao@gmail.com>
> Date: Sat, 19 Jun 2021 22:19:16 +0800
> Cc: emacs-devel@gnu.org
> 
> > > Could you please provide me with the optimization options applicable
> > > to Emacs 28, so that I can give it a try?
> >
> > Look in src/Makefile: what do you see in CFLAGS there?
> 
> $ egrep CFLAGS src/Makefile
> CFLAGS = -g3 -O2
               ^^^
This is it.  the same as in the Emacs 26.3 build, which is "fast".