Event Processing Time

const events = new Map([  ["connectTime", { start: "connectStart", end: "connectEnd" }],  ["domainLookupTime", { start: "domainLookupStart", end: "domainLookupEnd" }],  [  "DOMContentLoaded",  { start: "domContentLoadedEventStart", end: "domContentLoadedEventEnd" }  ],    ["onload", { start: "loadEventStart", end: "loadEventEnd" }] ]);   const observer = new PerformanceObserver((list) => {  const displayTimes = [];  list.getEntries().forEach((entry) => {  console.log(entry);  for (const [key, value] of events) {  const endValue = entry[value.end];  const startValue = entry[value.start];    const eventTime = endValue - startValue;    displayTimes.push({  url: entry.name,  event: key,  processingTime: `${eventTime.toFixed(2)} ms`  });  }  });    console.table(displayTimes); });   observer.observe({ type: "navigation", buffered: true });