Iron out some more kinks, Square-Enix... and please get those scheduled/expected Emergency Maintenances. 'Cuz the game's broke, yet again.
I really wish SE would implement some patch testing prior to releasing a major update and adding in all this lag to avoid such issues. It damn near makes the game unplayable following an update and the all but expected Emergency Maintenance(s) that follow.
Servers eating attacks, dropped combos, non-interaction or delayed events/NPC dialogue... dungeons aren't fun when they don't work. And, its definitely something on SE's end. Various people I play with, all have varying speeds... but we're all experiencing the same debilitating lag. The new fights are fun, but we don't lose to the bosses... we lose to the lag. That. Isn't. Fun.
Please, fix them. And, only add new content. Not lag.