I'm going to post the same thing in every thread I see pop up regarding the lag.
Getting r0 every 5-10 seconds EVERYWHERE I go in game. Has been happening since the update/maintenance on Sept 4th when the brought out the 1000MB patch file. Nothing I have tried fixes it. Already spoke to my ISP who assures me they are not blocking or throttling me in any way. We have a 30Mbps download speed connection, with 3-5Mbps Upload speed. Speedtests to multiple different servers around the world have come back normal, and all other games/mmo's connect and function as they should. Only FFXIV seems to be having this receive rate 0 lag issue.
I have tried other servers such as Sargatanas and Tonberry and I still get the same lag. The lag does not improve even if I am in non-traffic areas such as my inn room. I still get the lag.
15-20mins after logging in I often get error 90k.