Nostalrius Begins - Quality wow vanilla realm (1.12)

As of today i am lagging really bad 450-780ms constantly. yesterday was my first day on the server and i never went above 160ms it was amazing, is there anyway i can troubleshoot this?

I am located in Texas USA and yes i know the server is in Western Europe

Do you know how to use the cmd screen as in terms we are going to tracer where the connection goes wrong?