It was real slow when I had soft lighting selected, but when I selected full lights, they were all pre-calculated and the framerate shot up and the game became really fast.
In Build Game mode, I would recommend selecting 'Full Shadow Lightmaps' to help ease cpu strain with Full Shader Effects and Dynamic Lights, especially if High Textures are also selected, of which I have selected all of these in this case. I also installed patch 1.14 which I would strongly recommend to anyone using FPS Creator. I have ten levels in DarkConn, and pre-patch 1.14 the game would crash 6 times out of 10 approximately. Patch 1.14 speeded framerate up as well, and prevented the crashes, so was a godsend.