The servers are in mid US not west coast for anyone using a tunnel/proxy you need to set it to connect to a tunnel/proxy there to get a more accurate ping, someone above said they got 100-200ms… go run a traceroute or pingtest dot net to dallas texus to get latency and packet loss results because 100ms or even 150ms to Texas from Australia even from sydney would be near impossible due to how fast light(data) travels through fibre can travel and hop let alone perth which is even worse distance.
Most in reality regardless of proxy or not will get ~250 to mid US and ~200 to west coast give or take. These tunnel services can be misleading due to showing the latency to their proxy server not to actual game server and you must always set the tunnel/proxy to the closest server to the game server locations (mid US Texas for GW2) or the ping you see is not anywhere near your actual.