Poor FPS with high-end rig?

[Arale]

In cities using the Standard graphics options, I get anywhere from 40-50 and 30-40 if I'm running on maximum.

My frames seem very jumpy and unstable.

My specs are:

GPU: GTX 670
CPU: i5-3570k @ 3.4 ghz
PSU: 750W
RAM: 8 GB

Is the game somewhat unoptimized?

I haven't read any complaints from others on this subject.

I think it's fine. My rig is almost identical to yours, though my 670 is 4G VRAM, and my processor is a decent AMD 6100 6 core. I get 60 FPS everywhere but cities, where the sheer amount of people, actions and objects being rendered at max settings causes me to drop from 60 to 25-35 fps, depending. Just the nature of the game in my opinion. I also heard that the latest nVidia Driver works better with XIV ARR then earlier drivers do. I'll test that tomorrow, but a game that looks this good, you'd need a very good PC to be 60 fps in cities in my opinion.