Maria Sharapova before and after shoulder surgery.?

I was just wondering, has Maria Sharapova changed after her shoulder surgery a few years ago? For example, her foot speed and her full service motion? I feel like her fitness has diminished a little when I watched her play today against Li Na and I thought she was speedier before her surgery. What are your thoughts? One thing is for certain, she still has the mind set of a champion! Go sharapova!