Don't concentrate on how fast you can get. Concentrate on how efficiently you can play. The more economical your movements, the easier it will be to increase the speed. Nobody here can tell you how fast you can or should play this piece: it's your own body that will tell you.
Since you say you are working on bringing the piece up to performance level, I presume you can already play it faultlessly at a pace that is comfortable to you. Practice the piece no faster than this pace, concentrating on lightness, rhythmical precision, elasticity and economy. Stop often and ask yourself questions: are any muscles getting tight, am I keeping a good posture, could my movements be more fluid...
Don't push the speed: if you find yourself getting faster, use a metronome to keep you slower! When you really feel you are playing as easily and economically as you can, allow yourself to increase the tempo a bit. Keep concentrating on ease of movement and let your muscles tell you how fast they want to play.