[SOLVED]Terrible performance with a GTX 1070?

Hi guys, ive just bought BFV but im experiencing very bad performance. First of all, already installed latest drivers and my other specs are i7-3770K and 16gb of ram, game installed on ssd.

I play on 1440p and in BF1 i always played between 80 and 85 fps (ultra preset), really smooth experience. After game release ive read some performance benchmark about BFV and seen some lower performance, but always between 65 and 70fps, that for me is still ok. The problem is that game is running between 40 and 45 fps (ultra preset), its really strange and too low i think. Another strange thing is that lowering preset to High it boost performance just of 5 fps, arriving in an average performance of 45-50. Do you have a possible solution? Is it possible that the same pc has a drop of 40fps between Bf1 and Bfv? Its also the same angine.

Thanks all!