Testing performance of service workers vs promises

worker.js

function wrk() {
  var blobURL = URL.createObjectURL(new Blob(['(',

    function () {
      for (let i = 0; i < 5000000000; i++) { } console.log(1000);
    }.toString(),

    ')()'], { type: 'application/javascript' }));

  const worker = new Worker(blobURL);
  URL.revokeObjectURL(blobURL);
  worker.onmessage = (e) => console.log(e.data);
  worker.postMessage(null)

}

wrk()
wrk()
wrk()
//all values get logged together

async function prom() {for(let i = 0; i < 5000000000; i++) {} console.log(1000);}

prom()
prom()
prom()
//promises are async but not parrallel, still single threaded..
//logs with delays