A fantastic track, the progression is just right for the emotion of the track. Any faster and it would definitely take away. It also isn't too slow, it's just right.
A great piece.

Just amazing. Nothing else to say.

I like on how much of a deep, emotional feel it had to it. Like a sad part in a movie, great job man.

It depends on what you are going for, but rushing the progression takes away from the musicality of the whole piece. But if you are going for club play, they want to get right to it. It's all what the music is for.

I disagree with AncientDoom. I feel like if you sped it up it would be rushed. It is calm and relaxed. Perhaps more dynamic synths to sate the more ADHD types. (Not implying that AD is!)
It's not really dubstepp.. maybe.. chillstep?
doesn't matter. It's very pretty.