Running on linux here, I have a Lenovo thinkpad t420 (2011 era laptop), I had to tack on the command --rendering-driver opengl3 to get it to launch.
After launching the game and setting the lighting setting to low. When I get into the main room, looking in the corners of the room gets me 60fps locked, whereas looking at the well in the center of the room gives me 6 fps and the game becomes un-playable.
On initial glance I thought this might be a toaster friendly game, but as it turns out, it may not be.
I'd love to give this game another try when it has better performance : )