I have the exact same Issue. In the Steam Forums are many more People.(
https://steamcommunity.com/app/1091500/discussions/0/2988665684326976847/?ctp=6)
What i I´ve done till now:
-Delete all GPU Drivers with DDU
-Install the newest Driver(also tried install the previous Driver)
-Update BIOS (tested Versions 2502 an 3003)
-Turn DOCP on/off (RAM)
-Start the game with adminastrator rights
-Use multiple Monitors (16:9 1920x1080 and a 21:9 3440x1440)
-Update Chipset-Driver
-Re-install the game on different Drives
I only have 35fps on low, middle, high with RTX on/off and DLSS on/off, all resolutions
My System: 5900x, GTX 3090 Gaming Trio x, 32gb RAM Gskil CL16(B-Dies), Asus ROG Crosshair Hero VII (WI-FI), be quiet straight Power 1000W, WD SN850 1TB (PCIe 4.0) and 970 evo 1TB (PCIe 3.0)