Chopin was reported to have been quite upset once at a student playing the E major octave section too fast.
Tempo, in general, is a personal thing. When I learn a new piece, I go slowly, then when I get it down, I sometimes play it too fast. It takes a while to find a tempo that makes the piece speak to you--unfortunately, you don't have much time.
I like a slower tempo nowadays with the Ab. And, I don't play the thing as loud as I used to, preferring a more subtle approach. Otherwise it can veer towards militaristic bombast.