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From: Florian Weimer <fw@deneb.enyo.de>
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Subject: Re: Apparent quadratic behavior during mail fetching
Date: Mon, 18 Mar 2019 15:34:18 +0100
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* Florian Weimer:

> With Debian stretch's Enmcs 25.1.1, Gnus 5.13, I see what seems to be
> quadratic behavior when processing incoming mail.
>
> My mail-sources setting in ~/.gnus looks like this:
>
> (setq mail-sources
>       `((directory :path ,(expand-file-name "~/Mail/INCOMING")
>                    :suffix "")))
>
> I see many, many stat system calls for the files in that directory.
> It looks like the entire directory is reprocessed for each file
> contained in it.
>
> I use
>
> (setq gnus-secondary-select-methods '((nnml "")))
>
> as the mail storage backend.
>
> Does this ring a bell?  If not, I'll try to find the root cause.

It turns out that this:

(setq nnmail-scan-directory-mail-source-once t)

fixes it (in Emacs 26.1 at least).