Update 9 has added a very long and slow animation to Smite. It is so slow in fact that it is extremely difficult to land the attack on any target that is moving. So slow in fact that you lose a regular tack (at least one, with 2hf have not tested twf) in the swing time and end up basically just washing any DPS boost that Smite would have done.
Basically- Update9 nerffed paladin DPS by drastically reducing the benefit of Smites. It is no longer part of your regular attack chain, it stops your chain completely and preforms a very long pointlessly spinning animation.