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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: How to use "smart kerning" font features in Emacs using
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Date: Mon, 27 Nov 2023 17:22:39 +0200
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To: Steve Molitor <stevemolitor@gmail.com>
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 (message from Steve Molitor on Mon, 27 Nov 2023 08:47:41 -0600)
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> From: Steve Molitor <stevemolitor@gmail.com>
> Date: Mon, 27 Nov 2023 08:47:41 -0600
> 
> Thanks again. Last question: Does it make sense to optimize for shorter
> matches? For example, I could pull out the space to only match "words",
> and pull out and handle the "/" separately, to avoid matching against
> long file paths.

Optimize for what purpose?  If almost everything is going to be
matched anyway, I think it is better to send larger chunks of text to
the shaping engine, as that causes fewer calls and the shaping engine
will be able to produce better visuals.