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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Question about display engine
Date: Tue, 03 Sep 2019 20:31:18 +0300
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Cc: spacibba@aol.com, emacs-devel@gnu.org
To: martin rudalics <rudalics@gmx.at>
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> Cc: spacibba@aol.com, emacs-devel@gnu.org
> From: martin rudalics <rudalics@gmx.at>
> Date: Tue, 3 Sep 2019 18:41:40 +0200
> 
>  > What do you call "realize a face", exactly,
> 
> Whatever realize_face does with its attrs argument.
> 
>  > and why do you think it is
>  > so expensive as to justify doing that lazily?
> 
> Due to the overhead to calculate, cache and eventually free the
> realized face.

I don't think it's expensive enough to justify such premature
optimization.