the network speed is related to the area where the account is located, because you take the network speed of whichever service you set up, such as the DLC of the American version of the game, so you can only set up an American version of the account to download the American service. Generally speaking, Japanese service is not performing well in the mainland, while Hong Kong service is ok. However, according to Sony's speech at E3, they are going to upgrade PSN from Playstation net to playstation now, so the current situation may be that all services are pitted.