I almost never think of it as slow practice. It's usually a certain movement that needs to be isolated and thought about in more detail. And it's like I'm thinking about that movement frame-by-frame, taking it back to the workshop and honing it. Then, when I get back to playing, I play it at almost full speed (it may be 75% or so instead of full speed).
Interesting answers! So none of you typically do slow practice where you play an entire piece in a very slow tempo?
My teacher told me that slow practice was very important, so important that she did 85% of her practice at very slow tempos. The strange thing is that over nine years of weekly lessons I never managed to arrive at her house except during the 15% of the time she was practicing up to tempo.
It depends on where I am with my piece. With piece that is very slow already, I find slower practice to only be marginally helpful. However, with a fast piece (such as the Beethoven Sonata Op. 31 No. 3, my current recital project), you can never have to much slow practice. It is especially helpful if you do it with the metronome, and the score, carefully digesting every note. Likewise, running through it slowly, from memory, is an excellent way to ensure long-term retention. However, these methods are most helpful when one has already learned the notes of the piece. In my opinion, one should first learn it measure by measure, at or near tempo, and then commence slow practice to bind the whole thing together. I also find segmented slow practice to be helpful with memorizing--if I work on the memory in half-tempo, then I am not simply relying on a short-term muscle memory, but instead committing the work into my brain. That has been my process for my latest side-project, Fantasie Impromptu; I will let you know how it goes.
I almost never think of it as slow practice. It's usually a certain movement that needs to be isolated and thought about in more detail.
Slow practice for me is usually as slow as it takes to get everything like I want it to be.I usually try to get everything right first (technique, phrasing, articulations, etc.) at a slow speed and only when everything feels right do I increase the speed with the metronome.Speed is always the last thing I worry about. Everything else is usually more important to me.
Slow practice means playing at a speed where it is possible for you to make absolutely NO mistakes.
What speed would that have been for Rachmaninoff?
Maybe I should be less cryptic.When Rachmaninof played slowly at, say, MM = 40, he did so with the identical technique that he would use at 160. Or maybe 260, given it was him.When a beginner plays slowly at MM = 40, he uses technique that maybe, just maybe, might reach 55. The trouble is it is intuitive to play 100 times at 40, 100 times at 41, etc., until that incorrect technique is burned in so firmly it is difficult to unlearn. Sometimes impossible. If you play slowly enough to not make a mistake, I think maybe you are defining mistake as a wrong note. But a mistake can be the wrong technique on the right note.
Does anyone ever practice faster than the piece's target tempo?After I get a feel for a piece, if something's to be played leggiero and isn't technical in a way where I need to be vigilant about tension, I often play through it faster (and louder) than I would in performing the piece. Then doing it at tempo and at a softer dynamic feels like a breeze. But maybe this is mostly psychological.