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Date:	Mon, 31 Jan 2022 09:52:00 -0500
To:	cygwin AT cygwin DOT com
Subject:	Renaming (with 'mv') very large files is SLOW
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From:	cygwin AT kosowsky DOT org
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I tried renaming some very large files (20-40 GB) using:
   mv <oldname> <newname>
without changing the directory of course.

The process took about 10-20 minutes with Task Manager showing disk
activity of 100+ MB/s.

Is there something about such large 'renaming' that actually results
in the file being really moved (aka copied) rather than just renamed?

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