Mirror's Edge PhysX fix issues

Hi, I recently bought Mirror's edge and Catalyst during steam sales. I started playing the game and was instantly blown away at how good the game looks for a 15 year old title. However during the first mission flight, i encountered serious fps drops, which i found out to be due to physx. so i got to some digging and found several fixes, which include deleting physx files inside the binaries folder of the game. (links below)
https://steamcommunity.com/app/17410/discussions/0/490123727976080324/
https://steamcommunity.com/app/17410/discussions/0/360672047212982813/

Well, now i feel stupid, because this fix did not work for me. i also checked and i do have latest physx version installed and yes, i am playing on an nvidia gpu (rtx3070) although i have AMD cpu. Any ideas what might be other issues?