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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Is this "save practice" (setting default font scale)?
Date: Fri, 20 Nov 2020 22:05:10 +0200
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To: Arthur Miller <arthur.miller@live.com>
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 (message from Arthur Miller on Fri, 20 Nov 2020 16:37:51 +0100)
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> From: Arthur Miller <arthur.miller@live.com>
> Cc: emacs-devel@gnu.org
> Date: Fri, 20 Nov 2020 16:37:51 +0100
> 
> > The pitfall is that the change in the default face will not be
> > propagated to other faces that depend on 'default' (inherit from him
> > and don't specify their own size explicitly).
> Si, I understand. Does Daniel's answer (custom-set-face) have same problem?

No.  But I don't expect it to provide any speedups, either.