It's for the version sold in Asia only, it must be to do something with Flame Iori.
Anyway I was thinking of something else to explain the differences in online experiences... perhaps people with NAT3 connection get worse delay, if you notice, this game doesn't allow spectator mode or lobbies because it needs to establish a very direct connection between players, and with this type of connections whether you have ports open or not always has a great impact on lag and delay, I know it from other certain programs to play online like kaillera p2p, so if you want to do a serious report see that:
1. You are playing on wired
2. There's absolutely nothing using your bandwidth while you play
3. Make sure the other person has absolutely nothing using up internet speed too
4. Make sure both of you have a very stable connection
5. Both should have NAT2 connection.
6. Ping each other on PC opening a cmd window and using the /ping command to know the exact ping quantity you have with the other person and know how that ping quantity is reflected on the game.