The sim should instantly respond to lowering object detail to 30 if you are CPU bound. I noticed DLSS dx11 sucks compared to DX12beta. When
I run CODMW2 benchmark, it showed CPU 99% GPU 1% FPS 140, but i could totally play the game. Then Locked FPS in game to 90fps and got CPU 20% and GPU 80%. I was curious if i could keep going, lock 72FPS, CPU 2% GPU 98%. It showed me how the two rely on a balance as the 7ms avg latency on GPU went up to 17ms with GPU at 99%. So i locked in 90FPS to comply with my systems optimal cooling performance and the same method applied to FS20, observing FPS, CPU/GPU load, managable tempuratures and low latency. You must use tools outside the sim to determine system limits. I can share my sim graphic settings and Nvidia control panel settings, and you having a much superior hardware than my 8700K 4.1ghz 3090ti watercooled and overclocked system. To provide a comparrison. I do this between my 6700K 1080 system, helps me see which Sim parameters SHOULD improve performance, otherwise its NOT the sim. Modern hardware freezes to protect itself. My CPU and GPU are both watercooled and the H100 Corsair waterblock logo changes to red when water temps are too high. Funny thing, my CPU hitting 100deg and starts stuttering in game, i tap on my CPU cooler and i heard the fans spin down with CPU temps now at 54 degrees and butter sim. It was the CPU unable to efficiently disipate heat. Could also be 8 year old water pump going bad. Its like the Thermal Paste i used hardends when system is turned off, and i have to warm it up and ‘tamp’ the waterblock to smooth the thin layer of paste. Like concrete tamping.
Lastly, try caching an area to determine if its HDD/Network issues. You can lower the data bandwith to 5mb to see if its your Network performance causing systemwide stuttering. If the intro animations freeze at any time, your system is a fault. If so, these Asobo and BLACKSHARK animations are testing audio and cpu instructions under maximum read/write I/O loads. For me, it will freeze in the middle of the Asobo animation and i know it thermal locked early. Lowering CPU 4.1ghz to 4.0 allow animation to almost finish before freezing. Lowered to 3.9ghz was butter through all animations.