IF you lag as hell ,try this

[KisaiTenshi]

I just solve it

first,go
Documents\My Games\FINAL FANTASY XIV - A Realm Reborn
open FFXIV.cfg with notepad
find
<Network Settings>
UPnP 1<=change it to 0

now relog , you'r smooth like hell lol

EN is not my 1ST language,hope yull understand

if UPnP is disabled (or your router never supported it in the first place) then you have to open the ports for the game, otherwise you're relying on how smart or dumb the NAT logic is in the router. Basically UPnP tells the router to open ports automatically. There's some horrible advice out there from several years back about turning UPnP off on routers due to security issues, but it really depends on the router you have.