Fastest IO toggle

First I want to say hello and thank the developers for a very cool little board. Post man delivered a Pico to me the day before yesterday. One of the first things I do is figure out the fastest ways to toggle an IO pin.

Most methods produced something between 2.7 and 5.1 Khz.

This is the fastest I could come up with that produces 37.31 Khz. The only other method that I have not tried would be to duplicate the code below with inline assembly.

var start = new Date();
function toggle(){
  "compiled";
  var A = digitalWrite;
  var B = B2;
  for (var i=0;i<10000;i++){
    A(B,1);
    A(B,0);
  }
}
toggle();
var end = new Date();
var time = end-start;
time = (10000/time);
console.log(time.toFixed(2)+" Khz");

This may be of no use to anyone else but it satisfies my personal curiosity.