Why am I so slow?

The difference in character speed from MD1 to MD2 is insane. I don't get why Mojang made the character so slow in MD2, even without mobility enhancements in MD1, you were still able to keep up with enemy speeds. Now, in MD2, you are slower that the enemies and it's worse in Hard, because enemies do more damage, you do less damage and move slower than them. No idea why this was changed.