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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: macOS metal rendering engine in mac port
Date: Sat, 29 May 2021 22:10:20 +0300
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Cc: alan@idiocy.org, emacs-devel@gnu.org, aaronjensen@gmail.com,
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-Reply-To: <jwv1r9p2wod.fsf-monnier+emacs@gnu.org> (message from Stefan
 Monnier on Sat, 29 May 2021 15:06:43 -0400)
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Dmitry Gutov <dgutov@yandex.ru>,  alan@idiocy.org,
>   aaronjensen@gmail.com,  emacs-devel@gnu.org
> Date: Sat, 29 May 2021 15:06:43 -0400
> 
> The "rule of thumb" that I internalized over the years in my model of
> the world is that a "key press to display" of ~100ms is perceived by
> most people as "almost but not quite instantaneous" and only once you
> get below 50ms is it really perceived as instantaneous by most people.

That matches my experience as well.