By the way, how hard was this piece for those who played it?(...)
Dear Canardroti: The piece has three issues, in my modest opinion: - the clear execution of the chords in dotted rhythm; - the octaves in both hands; - the right hand arpeggio in 16ths. The hardest is the first, because the chords are sometimes played forte, and you must have a good technique of both hand and forearm to stroke the notes properly. The octaves I think you must always be aware, but in this case it's all staccato, so it's not that difficult. By the way, again we talk about the same kind of technique, and I must ask you something: which joints and muscles do you use to attack the chords and the octaves? If you're doing this wrong (trying to play only with the fingers, or stressing your moves), is a very probable cause of your mentioned cramps. Did you notice fatigue, pain, cramps, anything like these, playing another works? Finally, the arpeggio is long, fluid and secondary, so it gets some work till sounding as it is. Best wishes, and take care of your arm!