With the experimental build, I am getting some pretty smooth gameplay on my AMD A6 laptop (Yes, AMD! Yes, integrated!) With the UI turned off, the game runs at full speed and is more than playable on the grid maps. These guys complaining about bad optimization have no idea what they're talking about. This game seems pretty optimized to me.
IIRC Estama's computer runs on an AMD APU. I don't know what optimizations have been made to the game, but I'm sure he worked a lot on optimizing for the AMD APU's. I seem to remember from some post a while ago him saying how he was fascinated with HSA and the whole APU technology AMD has. (I could be completely incorrect. Please don't kill me.)