For past few days crazy rubberband lag on a powerful rig with 10ms/70+ Mbps connect..

[Aria_Stars]

unfortunately until this is fixed, the best thing I can suggest is to use a proxy tunneling service like Smoothping, WTFast, Battleping, etc (and the many other variants) because it will change the route your internet takes to the FFXIV servers. It's fixed my issues so far.