So I ran the game with my Integrated graphics card -Intel(R) HD Graphics 3000- it wasn't as great as when I run it with my GTX 555m, but the flow was relatively smooth and I can play the game with lower graphics nicely.
If you have FE, have you played the latest version 1.32. They did some good optimization to the rendering and seemed to do a lot of good. LH is using this optimized engine as well and ran much smoother than FE 1.00. Hard to say how it will run on your computer, but my best suggestion is if you have FE, that you check how it runs with the most up to date version. If it is running smoothly, then I believe that LH will run about the same.