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Just to bring awareness to this problem as SE is not discussing it or responding to people who have this issue, but many people currently cannot play the game. The problem is lag on the SE side where people freeze up repeatedly and get hangups as they play which makes combat unplayable. Its very important if you are 50 and trying to advance gear for fights like Titan that you be reactive quickly and this server side lag makes battles like these impossible. Here is a 104 page post(and there are more of them) from the FFXIV forums without 1 response from SE on a fix.
As for myself, I took the time to call my ISP and had it checked out and everything was fine and I have played GW2 and TOR without any issues, just FFXIV has this problem and many others confirmed the same. I haven't been able to play for 3 days which is disappointing because I do enjoy it.
While you might think, "well I'm not affected", it might the next time you login as more people are having this issue. Problem developed once they opened up sales again and more people are now logging in which has saturated the servers even more. They are promoting that they have over 600,000 concurrent logins at once yet the servers and many players cannot even play the game. And of course people from NA who login to the Japanese servers do not get the problem, once again it's just the NA servers.