>>357461359
It has something to do with something called the fall creator update. It was sabotage that microsoft intentionally installed on all computers to lower your FPS and force you to upgrade constantly. At least I suspect that is the intent, but that is the end result either way

https://www.nvidia.com/en-us/geforce/forums/discover/261401/scripted-fix-for-stuttering-with-fps-drop-post-win-10-creators-update-now-with-re-enable-script-by-/

As soon as I ran this, my fps went from 65 to a steady 90