What resolution are you using? I’m running the game on RTX 4060Ti 16GB VRAM at 1920x1200 and have no stuttering. I have DLSS enabled on Quality settings. Please be sure you are not using the exclusive full screen mode. It’s more of a headache. There were reports of very bad FPS with it. Borderless window works much better.
If it doesn’t help, could you please post your PresentMon stats? Please follow my guide here