Ever since patch 2.1 I've been getting some pretty terrible lag.
Have a Verizon FiOS connection, 50/25. Ping is perfectly stable to just about anything else I try (ICMP to FFXIV's IP is unstable as well), speeds are right where you'd expect them to be.
What I'm seeing on my end is players running for 2-3 seconds, stopping, teleporting a short ways, running another 2-3 seconds, etc. Titans weights will hit me without my ever seeing them land. In the middle of a fight everything will just pause for 2-3 second and then resume. Frequent 90000 errors, which I hadn't experienced since beta...
I had the occasional lag spike, but nothing unexpected before 2.1 Ever since just about anything with an instant kill mechanic has become exceedingly difficult or impossible. Normally I'd blame the ISP for something like this, but there was no issue before 2.1 and I'm not having the problem with any other games/browsing/downloads.
Found another thread on the general forums of FiOS users claiming to have the same issue:
http://forum.square-enix.com/ffxiv/t...-lag-since-2.1