Sorry SE, but endgame won't work if you don't fix something.

[Furio]

White knights will come in and take the bullets for ARR even when stating problems as obvious as this. I've played other MMOs with MS close to 400 (from overseas) and have never had any issue. In ARR my ms is 90 and it feels like it 9000. Seriously, you can't even be on interruption and do you rotation. If you do anything else, chances are it won't register. I remember interrupt duty for rogues in WoW. It worked perfectly and instantly.

Bad engine? Bad netcode?

Dunno. But it makes the game less fun, that's for sure.