I have a 5800x with a 3080RTX and game running on a NVMe, with 32gb rolling cache 32gb RAM. Over open country it is buttery smooth up to 70fps with all ultra @1440p. Now it is still smooth over NYC, at least frame rate wise it would be (>45fps) if it would not stutter to hell and back. So it is not really low fps if you catch my drift. The time stops and when the sim runs for a split second it is actually smooth only to lock up again. And I do not even need NYC for that to start. Any mid to largish town will do.