My son has an i5 2600, gtx970, 8gb Ram and runs the game off an ssd. He consistently gets 40 - 75 fps, the only time he had trouble was before the optimisation of the ground leveling tool.

I suggest checking your drivers and run it with vulkan, upgrade to an ssd and increase your ram.

the gtx960 needs to be replaced asap though they were absolutely terrible and performance on them was about 20% lower than the gtx950.