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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Image transforms as a benchmark?
Date: Sun, 12 Sep 2021 15:17:04 +0300
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To: Arthur Miller <arthur.miller@live.com>, Alan Third <alan@idiocy.org>
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 (message from Arthur Miller on Sun, 12 Sep 2021 13:45:39 +0200)
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> From: Arthur Miller <arthur.miller@live.com>
> Date: Sun, 12 Sep 2021 13:45:39 +0200
> 
> I wonder if image-rotate is handled completely by external libraries? I see
> no effect on performance, regardless of how many time I rotate some image.

It's handled by the window-system libraries: XLib or Cairo or
ImageMagick on Unix, GDI on Windows, etc.  So you shouldn't see any
significant performance changes in these functionalities due to
optimization switches.

> Is it same situation for scaling down? I see big difference when
> scaling up images so I guess that is handled by Emacs own code?

Not sure (is your build with or without ImageMagick?), but perhaps
Alan does.