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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Q: What is default architecture for code produced by native
 compiler?
Date: Thu, 26 Aug 2021 19:27:11 +0300
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To: Arthur Miller <arthur.miller@live.com>
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 (message from Arthur Miller on Thu, 26 Aug 2021 17:58:54 +0200)
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> From: Arthur Miller <arthur.miller@live.com>
> Cc: akrl@sdf.org,  emacs-devel@gnu.org
> Date: Thu, 26 Aug 2021 17:58:54 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Btw, -O3 is not recommended, as it frequently produces a slower Emacs.
> 
> Do you sugest some benchmarks I could try?

Any operation that takes long enough for you to be able to see the
differences would do.  It is best to use something that you personally
do a lot.