Post 2.1 Lag spike (Still not resolved)

[Nekodar]

Getting real sick of this lag. I can't play the game anymore without a VPN client because I get constant error 90000 and lag like HELL. I feel embarrassed to play with other players now because of the lag. I have no excuse for it--what the heck am I supposed to do? Square-Enix, seriously. Enough. Fix the lag. I'm tired of apologizing for something YOU'VE done wrong. My ISP isn't the problem, it's YOU.

If you can play fine with a VPN client, it's between you and SE.
There are more parties involved than just you, your ISP and SE.
SE is not directly connected to Level 3 or Cogentco where the actual problem is, and your ISP has decided to route you through either of them, whereas with the VPN client, the traffic either takes a different route or the VPN provider pays to have their traffic prioritized so that it's not affected by the real problem.

You can continue to bug SE about it, or to bug your ISP to route differently, of course.
Chances are still that SE is also being ignored by Level3 and/or cogentco.