How come Wow has a faster reaction time compare to ff14?

[Aureliami]

Because WoW checks if you are getting hit or not when you see the damage happen.

FFXIV check if you are getting hit or not first, then waits 2-3 seconds for the animation to go off, then the damage comes that kills you.

Lag has no factor in this.

You just have to understand the animation delay. Even if you live in the building where the servers are hosted the animation delay is still there. If you have a good connection and understand how the animation delay works you'll never get hit by anything. If you don't understand the animation delay then even with pingzapper or when living in the server building you'll still get hit.