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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Any idea about what makes Emacs slow reading on pipes?
Date: Sun, 18 May 2003 15:03:40 -0400
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    That is because emacs is using a pty by default for process i/o (I
    guess that is to avoid buffering output from the writer, so emacs will
    get a more steady flow of input to process, e.g. for compiler output),

I am not sure any more what the context is, but the usual reason for
using a pty is so that process groups and associated signals work.