After the earthquake in Japan last year I noticed my latency was way down. Since I am playing from South Korea, it's a fairly long connection. I managed while in the dorms about 300-350, but after moving into the towers with the family, it went to 400 or so. The earthquake did not help either as I averaged 500-700. Try healing with that!
Just noticed over the last week or so its been way down...perhaps it is time to start raiding full time?