Problem with fps (Destiny 2)

When you enter the game, a character, a problem, the solution of which is nowhere to be found, fps from 10-20 frames per second, the system is not weak, 8 gigs of RAM, gtx 960m, intel i5-6300hq , I'm not talking about the fact that the game is even on the scale doesn't respond (the mouse moves to the right), how can I solve the issue???