memorizing a peice faster than you can play it

[Septimus314]

Does anyone have such a problem where they memorize the measures faster than they can play it adequately or excellently?  My instructor said this could develop into a slight problem for me.  He said I had to slow down and take it measure by measure until i learned it excellently.  He said my brain would trick me into thinking I could continue along the new music because I had memorized it, but in reality I had to slow down to achieve the true quality of the music.  It's really weird I mean in school I always am the last to turn in my tests and thought I was slow but in piano I memorize the music so fast I dont know what to do.  I try to slow down but it's hard because I'm so eager to see what else there is and to learn the whole peice.  I mean i guess i have to be really patient.  Anyone else have anything like this?
Issac

[AMR]

Dear Septimus314,

 What will be helpful to you, in my opinion, is to really think about why you can't play these "memorized" measures up to speed.  You see, most of the time, things don't need "practicing," they need memorization.  In fact, what could possibly hurt you more is to think that these measures are memorized, "practice" them to make them better, then have something overworked and hackneyed at the end.  Let the piece evolve on its own.  Really evaluate what needs to be practiced and what needs to be memorized.  True, you may remember a measure, but having it memorized means that is pulls up in your memory instantly, note by note, in the right order.  
 Try focusing on your musical concept from the beginning.  Really, we memorize music, notes are memorized as a result of it.