It has an effect on downloading because it at least one end has to have port forwarding exposed. A seeder without port forwarding can connect to you if you have port forwarding enabled. If neither side has their port exposed, no connection can be made.
It has an effect on downloading because it at least one end has to have port forwarding exposed. A seeder without port forwarding can connect to you if you have port forwarding enabled. If neither side has their port exposed, no connection can be made.