GC speed

[wu@cs.wisc.edu (Felix S.-T. Wu)]

I am running T3.1 on a Vax8550 (~10 MIPS), the garbage collection seems
to be a little slow to me.  For instance, it took about 4.6 seconds (timed by
the provided "time" form) to GC a just started T process (with 4M bytes
for each half of the heap).  What I would like to know is: Is this GC speed
kind of slow or normal (or fast) ?  If it is slow, why is it ?  Is it
inherent because of T's data representation or what ?