In my experience higher poly count per se is not necessarily related to slow simulations in the cloth room. If the arrangement of objects is such that the simulation fails to resolve, it can take a longer time. Intersections for instance as already mentioned, or a cloth surface caught between two collision objects. Is Luke wearing any other garments that could be adding to the complexity? I believe triangle meshes tend to sim faster than quad meshes.

Poser 11 Pro, Windows 10

Auxiliary Apps: Blender 2.79, Vue Complete 2016, Genetica 4 Pro, Gliftex 11 Pro, CorelDraw Suite X6, Comic Life 2, Project Dogwaffle Howler 8, Stitch Witch