I am beginning to play this work. My Henle edition of the first movement says "So rasch wie moeglich", which makes a lot of sense as a tempo indication. But, there is anothe rmoarking, in brackets, saying 144 to the quarter note. I've tried this with a metronome, and I think it's a bit too fast... what do you think? What tmepo would you play the first movement at?