Many students practice slowly because they are afraid to make mistakes - but how else are we going to reach the tempo of a piece if we never practice it at the desired tempo? You can't learn to walk without trying to walk, or run without trying to run. Don't be afraid to fall down a couple of times. Make the mistakes and ignore them - enjoy the tempo instead. Do a little bit at a time, but get used to the new speed. We have to become conditioned to it.
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