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why I excluded GC times

including GC times makes for a very messy statistical situation.
GC time (or even if it happens at all) is dependent on the virtual
address space in use at the time, how much of the macsyma system
has been loaded (in the case of the KL-10), etc.  I do not know
about the LM figures, since I am only reporting stuff sent to me,
but the KL-10 and the VAX typically spend 30% additional time in
GC, averaged over various "production" runs.  Trading off GC time
for system paging time is a funny business, though I agree it
is important.