I always watch the last few fights of both fighters when I am interested in the fight, and I was watching the Jones-Hanshaw fight, and Jones looked way faster than he did against Tito, I mean his foot speed was a lot better, his right cross looked a lot harder and quicker, and he footspeed was a lot faster as well. Three things came into my mind.
1) He was trying to move more against Hanshaw, while he was trying to stand and trade with Tito.
2) If he respected TIto's power more, he wouldn't be as willing to open up offensively which tends to slow down handspeed.
3) The years have finally caught up to him.

I hope its the not the third reason because how quick Roy was in the Hanshaw fight would lead me to believe he would have a chacne against Calzaghe because in that fight his handspeed was way above what Joe is capable of. If it is the third reason Roy will be faster, but not by enough to make a difference in this fight, he needs the speed to overwhelm Joe enough that Joe won't make him fight 3 minutes of every round.