Framerate tanking on NFS Unbound (trial)

Product: Need for Speed: Unbound
Platform:PC
Summarize your bug Insanely bad performance issues even with DLSS + frame gen, losing 200+ frames
How often does the bug occur? Every time (100%)
Steps: How can we find the bug ourselves? Simply play the game. Ultra settings, DLSS, Frame Gen. Race, use the map, start a new day all as normal. Within 15-30 minutes the framerate will halve.
What happens when the bug occurs? FPS halves within 15-minutes to half an hour and keeps going down until you can't play anymore
What do you expect to see? My frame rate staying at 250 fps and not dropping to 45 fps?

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Ultra settings, DLSS, Frame Gen on. Also noticed it triggers early when you change a setting such as DLSS/frame gen. I have no idea why this happens. I want to buy the game but it's not worth it if I have to keep resetting.