Game is extremely unstable on the performance side.
Quite apart from the plethora of rendering problems evident on SLI, the performance of the game at 1440p/Ultra (with some reduction in post-processing and AA), well underneath my VRAM cap is abysmal. The tutorial demon fight was a combination of fighting against the controls AND the performance.
For info my rig...
i7 Haswell @ 4.4ghz
780 SC ACX in SLI on 344.75 and 344.80 fresh deployments, via a raft of different NVCP settings
32GB 1866 RAM
OS, pagefile and game client on high performance SSDs, with the game client on a dedicated Samsung PRO.
Win 8.1
To put this into some perspective, I can run Battlefield 4 at 1440p/Ultra with just a single frame issue when up and close with active armour. That's it. This, by comparison, feels like a huge step backwards especially considering the much slower pacing and traversal.
There is something fundamentally wrong with how this game currently works on PC.