Thanks Goalevan and GoAnSoNGo !
I believe these are excellent advices ! I do work on the first fast passage (that repeats twice) HS actually, and I also try it HT from time to time to make sure my hands position, fingerings, etc. are still consistent.
I start to be able to speed it up but I have to make sure that I keep the rythm even (if I play too fast, then I have some problems of synchcronization between the two hands)... I am thinking of using the metronome more systematically now in order to solve that problem.
Also, at a high speed, I have troubles with the pedal... it goes too fast ! I have heard a version of that piece that is really very fast and I wonder if the player (G. Cziffra I think...) actually uses the pedal... The pedaling is indicated on the music sheet though...
Also, in that version, it goes so fast that I cannot hear the little trills (Eb-F-Eb) that belong to that first passage...
Here again I wonder if they are actually respected... and if they CAN be at such a high speed ! That would have consequences on the fingering...
That's about it for now !
Thanks again !
Drooxy