Not sure, but I believe it was said somewhere that gameplay was actually optimised for 56k connections, so if you have any kind of highspeed you'll get your updates alot quicker, but during the actual game you're capped down to the speed everyone else is running. I find this hard to believe in the sense that this game pumps out alot of information, however it is a 6GB install + updates, so it's quite possible that the majority of files are stored clientside for faster loading times, hence allowing smooth performance on slower connections. Would also explain why the rest of my network gets the internet just as fast as ever when I'm playing FFXI, too.