Apart from the broken v-sync in both DX11 and DX12 modes (which thankfully but oddly does not exhibit any screen tearing in the former mode...) and some appallingly slow loading textures (it can literally take 3-5 minutes for them to fully load), the game runs really well on my i7-4770K, 16 GB, GTX 980 Ti, Windows 10 Pro v1511 setup. The framerate mostly stays north of 60 fps (according to Afterburner's on-screen display) with only a few dips below that in busier areas, that are not really that noticeable (unless I am looking at the framerate counter).
DX12 mode is a shocker though with similar performance but god-awful amounts of distracting and nauseating screen tearing. Seems like Io Interactive, as someone else pointed out on Steam, have released an Early Access title because how else do you explain the extremely poor quality control? The v-sync bug should have been picked up and fixed within hours IMO via a hotfix but, nope, instead, we get the new level and many still have to wait for the patch that fixes the previous patch!
*sigh*
Welcome to 21st century gaming...