I've a relatively low end system, so I imagine it won't run well for me, but I've been wrong plenty of times before. I never expect my ole stock HP from 2012 to keep up at all, but it's a neat way to help figure lowest denominator for devs/tech support. If your PC is newer than mine, and running a graphic intensive game worse, you need to do some maintenance/critical thinking for your PC problems because it isn't the game. I booted up, left all settings as they were and ran directly into the forest, then along the water to test the lagginess for low end PCs. At its lowest I'd say it dropped to.. 18 fps. And that was in the midst of the forest, sprinting. As soon as I stopped moving, it went back up to a mostly smooth 30 fps or so. The water was the same, a bit laggy upon movement and approach, but hardly unplayable. In the village, everything was pretty smooth, too. I never noticed any drops.
TL;DR: my PC performed exactly how I thought it would, ~25 fps average without adjusting settings, etc. Hardly unplayable.