I stumbled upon this thread accidentally, but I actually also have problems with lags in one, quite highly developed, map. I thought they were all caused by Factorization, but now I start to wonder.
How many UHS panels on one map do you need for them to create a lag? Would 6 of them (4 in one chunk, 2 in another) do it already?
Not really sure, thats what I am trying to figure out. We have a pretty high end server, and it only seems to be a problem when one person decides they need a couple hundred UHS with matching MFSUs running a few mass fabs. Other than that, we probably have hundreds of UHS's spread across the world.