you're joking right? I suppose this genius played in all england's games at the WC and is about to move to barca for £100m. He is a liability and has a mistake in him.
What has that got to do with anything? We were talking about his speed.
While on the topic of his quality though, why can't it be somewhere in the middle? He certainly hasn't become the absolute beast that I was hoping he would when he was younger and it's debatable whether he's good enough, but ultimately he has been our best central defender over the last four years. That may be more of an indictment on how bad all our other options have been over that time period, but until somebody actually steps up and takes that spot from him it will continue being the case. Rather than blaming him for that, blame the other options who haven't stepped up. Jones, Bailly, Rojo and Lindelof all make more mistakes than him, while also (other than Lindelof so far) being massively injury-prone.
And you contradict yourself: he is indeed slow of the mark and slow to get going, as you day. to me that means slow! it's what I am saying...
There's a huge difference between 'being a snail' like you claimed, and being slightly slow in the first two steps but then accelerating to one of the fastest players in the club.
Going by your logic, albeit taking it to the extremes, Usain Bolt is slow. He always had to compete against people who were faster than him over the first couple of steps, but his top speed was obviously much higher. Smalling is similar when compared to the people he is competing against.
The fact that pretty much everybody who has replied to you, including quite a few who don't even like Smalling, have said that you are ridiculously wrong in regards to his speed should give you pause.