Dont disable your anti virus, ports forwarding doesnt fix this issue either.
The real cause is there are ISP that have issues with the connection while playing the game
http://forum.square-enix.com/ffxiv/t...P2P-throttling
Welcome to the club, you are not the only one with this issue.
As of now all I can suggest is to keep using the VPN until Square finds a solution to this issue, and pray that the fix is soon...
