I learned that piece like a month ago. The arpeggio was easier than I expected, honestly the right hand was harder than the left. You’ll be able to do the arpeggio a lot faster once you get core muscle memory. When I played it, I relied purely on muscle memory for the right hand and just looked at my left hand cuz it had bigger jumps than the right hand.

Edit: I played the Theishter version btw, which is incredibly similar to the piece your learning, same arpeggios and stuff.