Threads are pretty fat -- It looked like roughly 12-20MB per thread if you install all the packages (it's less for just the core). I think leaving it at
5 with a BOLD comment that it should be increased for production sites
on dedicated boxes is probably the right answer.
Actually the right answer is to get ttrace working which would decrease that
footprint and thread create times immensely, but I tried and did not manage
it. I am sure Zoran would help though.