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I really hope these guys hunker down and do something about frame rates before official launch. I just bought a 980GTX and it made no difference with this game. That's along with my i7 with 8gigs of ram.
Out in the open away from the city standing perfectly still I get almost 90 FPS, the minute you start to move and look around FPS plummets to 25.
There isn't a single place I can find where frames don't get destroyed while moving or looking. Game looks promising but there is currently something really broken with the rendering engine. Granted its running on Unity and its alpha, but there are some amazing looking Unity games that run silky smooth so I know its possible.
Good luck devs, I'm rooting for you.