I am learning this piece at the moment and also have the same question in mind - how fast should I play it?
I have heard recordings and all of which are played super fast, so I was in deep worry that I could not play it well. Having read the replies above, I am relieved. The interesting thing about this piece is that, whether you play it at fast/medium/slow speed, it is still lovely

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Therefore, I think it is more important to focus on expression and the techniques in playing triple against quavers, rather than speed.