Are you using cable internet to play FFXIV?

Then you are in violation of the TOS possibly. Using a method other than dial-up may be considered using a third party to access the game which is not allowed.

Personally I made a long distance call to SE Japan's data center number, then place my rotary phone down on to my modem receiver box. After that I'm good for a gaming session for quite a while. I highly recommend it. I experience zero lag this way.

Those of you using cable are manipulating the game data in ways that are not allowed and it really grants you no special benefits. I can understand it's cheaper than calling Japan long distance, but it's something you just have to do if you truly are a Final Fantasy fan.