@prestidigitator: Hmmm... aurifelix's problem seems unusual, in the sense that a system like his should provide a better performance. The issue you are mentioning is certainly worth looking into, but I imagine it affects everybody, not just aurifelix.
@aurifelix: 19 ms for rendering wouldn't be too bad on its own as it would correspond to a respectable 50+ fps. I'd be interested in seeing the numbers you get for rendering when the frame rate is down to 10-20 fps. Also, I imagine you waited until all chunks have been loaded? If you press F3 there's a little counter, vus. If you keep the player still, when that number stops
I think all chunks have been loaded. Before that point the loading process might temporarily reduce performance. To wait less, reduce the view distance in the video settings. Concerning integrated GPUs, I thought also desktops could have them, to reduce energy consumption during low loads. But maybe I'm wrong. Rather than checking what Terasology is using I'd use the nvidia tools to force the specific application to use nvidia GPU.
Bottom line is: with the elements I have right now I'm struggling to find an explanation. I have not been around much but I haven't heard too many reports of poor rendering performance. This would cautiously hint to something else being at play. Pinging
@Cervator for more general checks to do.