I am on the xbox version and my friends are on it also and the lag happens same time even with all effects turn off , heck we can be on the mic and locks all us same time when that happens and the lag happens at the same time. The campaign battles were not this bad. Wildkeeper reives with 200+ people are locking the xbox up again like besieged and like your in slow motions unable to macro or even manual chose on the direction key to party member to heal.
I know they can run a better servers since ff14 do not got this chop framerate lag like this with this amount of people in the area . Feels like your just running into a wall not the normal lag, because is it the old ps2 dial up code, I know on the pc version they been hidding the choppy or lag on there pc with software. or is it just old ps2 code that messing it up that been emulated for the xbox version.
If can maybe just make a server for NA/EU players that can transfer to that server if it a long distance for many. I ping 100ms to 200ms japan, EU and NA us under 100ms. and a few friends on fiber got same problem. they ping in japan under 100ms.