First of all, I we are using Windows XP on two computers in my house, but I have read posts that players using Windows 7 also have had the problem.
Secondly, while logging in from the password screen, I frequently get the Error Message POL-0011 "Network busy or no response from server. Please try again later." I hit "Retry" and sometimes it works, sometimes it gets the same error message again.
Thirdly, while logging out in my Mog House, the game instantly logged out and went to the "Select Character" screen. Now, even in Asura as well as Quetzalcoatl, it sometimes does nothing for about 15-20 seconds after I click on "Log Out". If I click on "Log Out" again, it asks if I want to abort the Logout, which tells me it is logging out but very slowly as compared to 3 days ago.
Fourthly, after such a long wait to logout in my Mog House, the screen did not go to the "Select Character" screen, but went black and gave me error code FFXI-3100 "Cannot connect to lobby server". If this "lobby server" is the one that we go through to get to the servers for each world (Asura and Quetzalcoatl), then the problem could be there in that lobby server.
Add to that the "Search Failed" messages while looking at sale history on the AH and the congestion while using the Delivery system, it appears that something (modem, router, or lobby server) cannot handle the exchange fast enough.
But the big question is "Why did it start with me on June 3?" I had no problems with this before then (or it was very rare) and I made no changes to my setup. Maybe SE made changes in the game that my older system now cannot handle?