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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.help,gmane.emacs.devel
Subject: Re: maximum buffer size exceeded
Date: Thu, 06 Sep 2007 00:59:38 -0400
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To: storm@cua.dk (Kim F. Storm)
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    The only drawback I can see is that Lisp_Objects have to be allocated
    on 16 byte boundaries rather than the current 8 byte boundary, so a
    little space may be wasted (and maybe not...).

For cons cells and floats, it would mean half the space is wasted.
Markers and symbols and miscs will also waste space, but a smaller
fraction.

It would be useful to calculate the expected amount of waste in some
real Emacs jobs, and compare that with the total memory usage.