Whenever any graphical effect of any consequence occurs, the game either stutters or comes to a grinding halt. For instance, if I hold on to a wall long enough that I can no longer do so, whatever animation that plays causes the game to completely freeze up for a couple seconds. I've tried installing the XNA thing that I saw referenced elsewhere, but that didn't change anything, and I'm assuming that my computer is well over the suggested system requirements. What else could I try?