433MHz Receiver

Hi!

I'm playing around with a pair of 433MHz receiver/transmitters and while everything works great on the transmitting part, I was trying to pair two espruinos (as test-replacement while waiting for my NRF24L01+).

The problem I ran into is that when I set watches for the receiver it seems to put too much load on the board, making it nearly impossible to run anything else.

Is there a trick to handle the receiving part with less processing power or is this a waste of time and I shouldn't even try?
As soon as I pull the plug from A0 (data line), the terminal becomes responsive again.

I just used one of the example snippets:

var t,n;

// When the signal rises, check if it was after ~5ms of delay - if so (and if we have a code) display it.
function sigOn(e) {
  var d = e.time-t;
  if (d>0.005 && n>0) {
    console.log("0b"+n.toString(2));
    n=0;
  }
  t = e.time;
}

// When the signal falls, measure the length of our pulse. 
// If it was within range, record a 1 or a 0 depending on the length. 
// If it wasn't in range, zero it
function sigOff(e) {
  var d = e.time-t;
  t = e.time;
  if (d>0.0001 && d<0.001)
    n = (n<<1) | ((d>=0.0004)?1:0);
  else
    n=0;
}

setWatch(sigOn,A0,{repeat:true,edge:"rising"});
setWatch(sigOff,A0,{repeat:true,edge:"falling"});

Thanks for any advice!
Mario