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From: "Richard M. Stallman" <rms@gnu.org>
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Subject: Re: Changes to th new GC percentage feature
Date: Fri, 29 Jul 2005 23:34:00 -0400
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    what exactly is it trying to do?  The only changes I can notice are:
    - the bytecode interpreter and the eval and funcall functions now check two
      values rather than one, thus being slower.
    - read_char tests gc_cons_threshold.

There is code that temporarily changes gc_cons_threshold to prevent
GC from occurring.  It was broken and caused an infinite recursion.
I think this is the clean fix.

The slowdown is surely insignificant.