For those wondering why it is that SE seemingly can't make their game as responsive or as fast as Blizzard or Trion, it may be worth mentioning the obvious again. That being, this is a game served from Japan. For better or worse, any problem that Blizzard has to deal with downstream is going to be compounded orders of magnitude worse for SE servers.

Yoshi-P is saying that they can do better than what they have right now, but light only travels so fast. FFXI handled it by fundamentally designing the game around a 2-3 second delay (long casting times and relatively slow movement obscured the fact that things you saw on your screen were actually 2-3 seconds off everyone else). For whatever reason, FFXIV was not.