This is the thread.
http://ffxi.allakhazam.com/forum.html?forum=10;mid=1195524089131411019;page=1#m1195526221133764770
There was just a massive update for the game and there are many people reporting problems with extreme lag. The OP has figured out what the problem is and how to at least get past it(problem with Logitech equipment.)
Can we get a temporary sticky before the main forum is deluged with lag posts?