Hi I found this and its pretty well written and lists all the pitfalls of hosting a sim or set of sims on your pc. I am seeing a lot of people trying to push their pcs as if they are running it on a proper backbone with the bandwidth to handle complicated networks.
The reality is any NWS installed on a pc that you simply have a regular isp account with is going to be limited by the bandwidth your isp allows you. Here is a good write up of the "bewares" and minimum specifications needed to get a studio running.
http://forums.osgrid.org/viewtopic.php?f=9&t=1360Instead of writing my own which would say almost the same thing hehe I will just post this link.