Sad. What a horribly inefficient engine.
Unfortunately, I am having a similar experience with Wasteland 2. My rig handles games such as Metro 2033, Alan Wake and The Witcher 2 smoothly, but when it comes to Wasteland 2 my graphics card fan starts roaring like a jet engine. I hope Project Eternity and Torment: Tides of Numenera are better optimized, because...you know...Unity!