Well, I remember when I benchmarked the game, that if I stand still the game would deliver 60FPS. But as soon as I started moving the game dropped to around 40/50 with the CPU Usage jumping to 100% and the GPU usage dropping, having a massive bottleneck. If there is an engine that I hate the most it's clearly that ID Tech 5, it was awful in Rage, evil within, wolfenstein, any game that had that engine, the optimization was bad. In dishonored 2, the dev team claimed their void engine was based on ID Tech 6, to be honest I think it was a lie, since ID Tech 6 was debuted with DOOM and Dishonored 2 was released some time after, not much, it was impossible that the VOID Engine was using the 100% of the ID Tech 6, I am starting to belive that the VOID Engine it's the ID Tech 5 with some refinements, since it runs like **** too, and don't look to different either, I can't see any similarity to ID Tech 6, but find a lot of them to the ID Tech 5, things like SSR and many other stuff on VOID engine are exactly the same to the ID Tech 5. Carmack was a genious and had good ideias, but I think he was stuck in the past in many stuff. Tiago Sousa made an awesome job with ID Tech 6, and pretty much shows how much he had learned with Crytek with their Cryengine, Tiago Sousa worked several years at Crytek, I think demonstrates pretty well how Doom have such great visuals. Prey is from the same developers as the Dishonored 1 and 2, but they are going to use Cryengine, so I believe that it would work much better than ID Tech 5 or their Void Engine.