@atlaskit/editor-common/dist/esm/utils/performance/navigation.js

A package that contains common classes and components for editor and renderer

import { isPerformanceAPIAvailable } from './is-performance-api-available';
export function getResponseEndTime() {
  if (!isPerformanceAPIAvailable()) {
    return;
  }
  var nav = performance.getEntriesByType('navigation')[0];
  if (nav) {
    return nav.responseEnd;
  }
  return;
}