Huge Lag with Righteous Fire

Hi there, since I started using Righteous Fire with my new Char im getting extremely long lags and sometimes even disconnects.. tried different graphic settings.. nothing running in background. My other chars dont have these issues..
This only happens with Righteous Fire!

Is this a known issue?
Anything I can do on my side?

edit: i reinstalled the game with the official download.. no improvements..

this just happens with righteous fire, but makes the character absolutely unplayable..