Integrate PerformanceObserver for detecting when need to delay loading chunks or decrease workers count

[zardoy]

eg can monitor the number of events per second

const observer = new PerformanceObserver((list) => {
  const entries = list.getEntries();
  entries.forEach((entry) => {
    console.log(entry);
  });
});

observer.observe({ entryTypes: ['longtask'] });

if there is event, loading should be delayed. also worth monitor event events...