What resolution are you running at and what CPU do you have? I have a Ryzen 3900x and an Nvidia 3090 and in the Constellation headquarters, I am seeing around 34fps at 4K. I have to lower the render resolution to 55 to make it more responsive.
Switched to Experimental to see if that made any difference. Not really. On load, gpu is sitting around 60%. After going into and back out of the cave again, GPU sitting at 90% usage. CPU constantly around 60%.
Seems like there are some optimisations that need to happen, better unloading perhaps.
I am seeing 90% usage as well. For CPU, I've been noticing that there's one or two cores that get slammed to 100, so I am thinking its a CPU bottleneck. Makes sense considering that in some areas, lowering render resolution doesn't do anything.