surprisely my i7 8700k,16gb of ram and a 2070 rtx handle that quite good whitout passing over 55°C ! ^^
took forever to load and stuck at 15fps whitout any softbody or hair sim but it's working !
yes, the physics processing in the game is the limiting factor but interestly you can load up a lot of models and due to the limits of the old unity engine you actually havea a lot of spare processing power - of course you'll run out in the end at some point