Performance doesnt really matter,
If you want to get maximum lvl wich is 109,
you have to start an all-rounder , winger and put 6 points on speed, 6 on dribble and 2 on power. and start at lvl 75 atleast
This way you make sure you dont have to waste points on training speed and agility since it will never go up more then a few lvl's. even if u use lots of training points.
So playing matches and getting good performances might get you a slight advantage, but on the long-term you wont really notice it.