I'm hitting very high GPU usage(97%+) and ~40 FPS in particular areas. (Main office, the upstairs hallway and the area near the door to the garage)

The performance issues seems to be related to lights. As I can feel a significant impact to the framerate when I turn the lights on the upstairs hallway on, and lights in the ground floor hallway has a lower but still noticeable impact. Without lights, I can maintain 60 FPS without issues.

I then played around with the settings, but even with shadow set to 1, I still can't get a consistent 60 FPS. I then spent hours cleaning up the base, but did not notice any improvements.

I booted up 0.8.2 just to be sure I weren't misremembering things. And sure enough, no matter what lights I have on and off, how cluttered the base is, GPU usage remained around 70% and FPS is always at a smooth 60.

I'm running the game at 3840x2160(4k) with a 11900k & RTX3090. I have tested DirectX 11, DirectX 12 and Vulkan. DX11 and DX12 performed similarly, while Vulkan gave me much lower framerate.

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Wondering if anyone else is having this problem

Use cheap window shader, decrease shadow and foliage quality. Also 0.9k runs pretty good.

Are you using the right Nvidia DX version for your system? If your system uses DX 12 and you're using DX 11, it's going to make the game's performance tank massively, same for the reverse. If it's set up correctly, it should be much easier to run, and changing the shadow quality will have a greater effect.