I feel like ISPs are still the leading problem ever since the improvements done to FFXIV's connectivity. However, it seems that these end up with their notorious routing problems far more often in FFXIV than in WoW. For example, each time I enter a new instance server in FFXIV I have a chance that my connection will switch from perfectly fine to having 10-second freezes and speed-ups about a third of the play-time (essentially unplayable), and the connection seems far more prone to bog down due to bandwidth throttling. In WoW, regardless of what server I'm temporarily transferred into, the route stays the same except when my ISP changes routes for 'prime time' usage (which merely causes occassional position-offsets, making pretty much only Backstabs and melee attacks on charging enemies annoying). Additionally my average (though easy enough to make up for) ping in FFXIV is around 320-480 ms, while it's around 20-45 in WoW.