He's still quick, but I personally doubt he's as rapid as he was in say, 2010. The way he's playing right now reminds me of someone like Pedro, with short, quick bursts rather than the pace to just knock it past you and outrun you a la Bale or Bolasie.
He does look very fit generally though, at it shows mostly in his endurance/stamina which has been excellently as he's done a great deal of tracking back this season.