Hi Matt,
well I guess you checked it already, but I've to ask anyway.
Did you check the processes in the taskmanager, maybe something eats
up one core of the CPU? And what comes to mind next, does the node render
with as many buckets as it should? If so, did you check if 3dsmax is running
on ~99% or just on 50%?
And somehow I do remember vlado mentioned that, if you use 3dsmax 9,
it asumes that you have just one core or something like that and it was
needed to push max to use all cores ... dunno if this is still the case with
all the updates lately.
Hope this is a start, ... hehe! ;o)
take care
Oleg