Drzewiecki Design

Try reducing light draw radius, this is most likely why it is only happening at night and with HDR.

As others have said, the issue is only present at night, so Laminar should really look at it at night. It is almost certainly to do with the lighting, and most likely the radius of the light is causing the issues.

I am having the night lighting issue as well. If it helps, I am not using any light modifications, and while my FPS drops, my GPU will be sitting at 100% utilization, with plenty of VRAM available.