WORKER RETARDO

const ping_delay1 = new Worker('ping_delay1.js')
ping_delay1.onmessage = console.log

const ping_delay2 = new Worker('ping_delay2.js')
ping_delay2.onmessage = console.log

// ping_delay1.js
self.onmessage = e => {
  const timestamp = Date.now()
  while (Date.now() - timestamp < 5000);
  self.postMessage(e.data)
}

// ping_delay2.js
self.onmessage = e => setTimeout(() => {
  self.postMessage(e.data)
}, 5000)