Detecting movement

The Puck.onMag function returns an orientation about once per second. Is it possible to speed that up somehow? I can get faster readings by repeatedly calling Puck.mag(), so it's possible. (Although if I ask for too many, too fast the program crashes.) That said, I would prefer the event-based polling. Is there a time constant somewhere that could be changed?

Here is the code that generates the overflow, btw.

var x=0;
var y=0;
var z=0;
var f;

var zero = Puck.mag();
console.log(z);

while(true){
f = Puck.mag();
x = f.x - zero.x;
y = f.y - zero.y;
z = f.z - zero.z;
console.log(z);
}