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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
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Date: Sat, 19 Jun 2021 16:49:44 +0300
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To: Hongyi Zhao <hongyi.zhao@gmail.com>
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 (message from Hongyi Zhao on Sat, 19 Jun 2021 21:42:09 +0800)
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> From: Hongyi Zhao <hongyi.zhao@gmail.com>
> Date: Sat, 19 Jun 2021 21:42:09 +0800
> Cc: emacs-devel@gnu.org
> 
> > 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?

Look in src/Makefile: what do you see in CFLAGS there?