On the other hand, thanks for the comments as I didn't know that about the Prelude and being easy in execution maybe I was overconfident on it but I'll surely will change it.
Yes, some propose that to be the correct way, which is called tempo rubato I think, strict metronome tempo on left hand and rubato on right hand only. I read some time ago on a book about the pupils of Chopin that he mostly suggested that in many of his pieces, I've never tried it as I prefer rubato on the left hand on that prelude but will try it today to see what it comes.[/quotehows it possible to do rubato in one hand only? that would make the piece sound rhythmically incorrect. The Left hand can slightly slow down at the end of most of each measure in this pieces but pick up at the start of the next measure.