OK let's tackle this again Yadehoo, i'm concerned at your statement suggesting you're now "performing" Chopin's Etudes...regardless of tempo.
There was an extract from an article I have read recently that has altered my idea of slow practice that i think would be worth taking interest in.
I agree that slow practice in itself is good to engage your brain, to remember the notes the idea of the piece, phrasing etc. But don't get tricked into thinking you can just slowly, slowly increase the speed. There has to be a clear increase in speed when you're comfortable with the notes, but understanding the motions will not be the same is important.
Credit to the information I have taken out of Dr Chang's book for this next example, but imagine a person walking, you can walk really really slow, or you can walk really really fast, but you are limited by the motions involved in walking that you hit a certain speed you cannot go any faster. (power walking?!)
Now it is at that stage you are stressing your body out by forcing speed that isn't supported by that motion, what do we then do? We start jogging, running, there's very different motions involved to obtain the next level of speed.
Now at the piano, psychologically we will end up very stressed because while we can build up a lot of speed in this "walking pace" of learning a piano piece, you are going to hit a wall where you are trying to use motions not built for the speed you're hoping to obtain. The problem with tempo increase is that we will sit at that tempo trying to play, thinking we cannot do it because we using the motions we have ingrained the last 500 times of practice at slower tempos...
The two ways around this are -
Play at a reasonable tempo already (to ensure your practice speed is at a slow jog rather than fast walk)
OR create big jumps in tempo increase to ensure you are surpassing that stressed walking stage.
The problem with the second plan is you could still hit that wall on one of the tempo increases and also even if you jump over that stressed stage you're still going to feel uncomfortable with the new motions that will be required at the new tempo.
Suggestion 1 has the most promise in my opinion, playing a piece at no slower than 50% of it's original tempo to ensure there is already fast motions required. So this creates some questions.
What if you cannot play a piece accurately at 50% speed? my first thoughts are you are not ready for the level of difficulty! if you are the persistent type, breaking the piece down to it's core will help you create exercises and studies that tackle what you are trying to learn in a manageable way, a way that cannot be obtained by repeating parts of the piece that you already do not know how to do!
Your example of the op 10.1 etude you posted a couple of weeks ago is essentially arpeggios, so practice normal arpeggios.
Note when I say 50% I don't mean off the bat of seeing the notes for the first time, I mean you've read a couple bars, you've played the notes you know where you got to go, you do a couple of tries at that slow walking pace and then increase the tempo to 50%.
Now the reality of piano music is the faster it gets, the harder it gets. The more notes per second required is what makes our brain work harder, our fingers work harder and our true accuracy tested. It is no surprise that Chopin's etudes are very high tempo and a hell-a-lot of notes which is why many users on here advise that you are to start on simpler, manageable pieces rather than sitting on these for months on end.
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That's your post from June right, 5 months ago. In 5 months dabbling on this piece (and others) you don't seemed to have achieved anything that you can perform (or that we are yet to see) or proven any dramatic improvement in playing.
Are you even at a stage where you can fluently play any Etude from start to finish?
Cmon man, take a realistic approach to this and rethink your piano practice methods. People are advising on here, not insulting. (most anyway lol)