Hm. It's been AGES since I actually had a chance to try netplay. Regardless, it's gonna chug. Make sure you have your firewall open, make sure neither end of the connection is behind a local router (i.e. both ends have IP addresses in the same space; either both on the same LAN or both on teh interweb). The more distance in the connection, the slower it will run. You may also want to make sure both players are running not just the same game but identical ROM files...