I am not sure what happened. Through beta I've had no issues, fps were in the 50's. Early start, same same. This morning I had no issues till about 3pm HST (hawaii standard time) when the lag got worse and fps dropped. At 10pm HST the game was unplayable...10 fps. I even dropped everything down to low settings...still 10 fps.
Now I do not have the fastest machine or the newest but I haven't had game breaking issues till now. Below are my specs but considering the abrupt change in playability I am going to point back to ESO itself as the problem:
Radeon HD 5850
Intel i7 920
6gb Memory
Win 7 (64 bit)
All drivers current