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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Emacs's set-frame-size can not work well with gnome-shell?
Date: Wed, 22 Jan 2020 17:55:29 +0200
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Cc: rudalics@gmx.at, emacs-devel@gnu.org, tumashu@163.com, dgutov@yandex.ru
To: tumashu <tumashu@163.com>
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> Date: Wed, 22 Jan 2020 16:04:21 +0800 (CST)
> From: tumashu <tumashu@163.com>
> Cc: "emacs-devel@gnu.org" <emacs-devel@gnu.org>
> 
> Today I test lucid emacs again,  maybe the slowness is  posn-at-point
> 
> (benchmark 1000 '(posn-at-point (point)))
> 
> "Elapsed time: 0.684959s"

That's 0.7 msec per call.  Is that really an issue?

In any case, the performance of posn-at-point depends heavily on
what's in the buffer, and even on how close point is to the beginning
of the window.  So testing the speed in a single window with a single
position of point is not really representative of what can happen
elsewhere.