Sorry for double-posting, but somehow I cannot edit my post.

After messed up a little bit, I learned that:

1. I can delete a figure sometimes, and sometimes it will turn my poser to a "not responding" state.

2. When I conform a clothing via drag-and-drop (not from Figure>Conform to..) strangely it worked fine.

Other than those strange cases, my Poser Pro 2010 work smoothly and faster than my old P7.

I think maybe this information will help someone. :)