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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: It's almost 2016 and when (single-threaded) Emacs hangs,
	you	gotta be smashing your keyboard!
Date: Fri, 20 Nov 2015 09:54:32 +0200
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> Emacs can work fine with slow external processes; we interact with them 
> asynchronously. If Dired doesn't (I'm not sure)

It doesn't.  It calls call-process.  (And it's not Dired itself, it's
the insert-directory function that Emacs provides.)

> that could be fixed.

Indeed, I think doing that will go along way towards solving the
problems with listing slow directories, let alone getting hung while
at that.