Float Speed Espruino Pico VS Pyboard

Just now, I am testing this with a "compiled" directive.
Simple changes are: code inside very identical functions, except that the compiled one needs to declare the i variable.
Results are:

compare()
Starting non compiled espruino pi at 1514037569001.04614257812
Pi: 3.14159365358
Took 446121180.6640625 Microseconds for 1000002 iterations
Starting COMPILED espruino pi at 1514038015123.26708984375
Pi: 3.14159365358
Took 36048217.7734375 Microseconds for 1000002 iterations
=0

So there is a speedup of a factor 12 to using the "compiled" directive.
I had experimented a comparable speedup in a gps checksum computation 2 years ago.
See here

function testcompiled() {
  "compiled";
  var iterations = 1000000;
  var x = 1;
  var pi = 1;
  var i=2; // required for compiler
  var begin=Date.now();
  console.log("Starting COMPILED espruino pi at", begin);
  for (i = 2; i < iterations + 2; i++) {
    x = x * -1;
    pi = pi + (x / (2*i-1));    
  }
  pi = pi * 4;
  console.log('Pi: ' + pi);
  var end= Date.now();
  console.log('Took ' + ((end-begin)*1000) + ' Microseconds for ' + i + ' iterations');
  return pi;
}

function test() {
  var iterations = 1000000;
  var x = 1;
  var pi = 1;
  var begin=Date.now();
  console.log("Starting non compiled espruino pi at", begin);
  for (i = 2; i < iterations + 2; i++) {
    x = x * -1;
    pi = pi + (x / (2*i-1));    
  }
  pi = pi * 4;
  console.log('Pi: ' + pi);
  var end= Date.now();
  console.log('Took ' + ((end-begin)*1000) + ' Microseconds for ' + i +' iterations');
  return pi;
}

function compare() {
  return test() - testcompiled();
}