Recently I launched destiny 2 to play for a bit and all of a sudden the performance was just absolutely terrible. No settings had been changed and no driver updates since I last played. I run at 1440p max settings normally and would get 90-100 fps. Now, no matter what resolution or settings, I get 40-50 fps with horrible mouse lag. None of my other games have this issue. All of them max out 100% gpu usage like they should. But destiny get 50% (or lower) at 1440p and just lower with the resolution. (20% at 720p). Cpu is at 30% max on any of the threads so it cant be a bottleneck (especially cause it used to run fin and all my other games still run fine). I've removed my oc on gpu and cpu, reinstalled drivers( with ddu), reinstalled the game, and reset all of my nvidia settings( yes I know ddu did that, but just for good measure). I just cant understand why this is happening and only in this game.
Specs:
CPU: Ryzen 7 1800x @3.9ghz
RAM: 32gb corsair lpx@2400 (slow for ryzen I know, I'm upgrading it soon)
GPU: RTX 2070
PSU: evga supernova 750w
Please help. TIA