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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 15:04:00 -0400
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    We might change it so that, after stashing the stuff in a buffer,
    Emacs looks again if more data is available from the same process.
    If so, also read it and stash it in the buffer, too.

That is worth trying--it might not be too hard to write.  But I think
the problem is in Linux, so the real solution is to change Linux.