JSFiddle - React, Tailwind, and code Playground

JavaScript

function getTiming() {
    var performance = window.performance || window.webkitPerformance;
    if ( !performance || !performance.timing ) return null;
    return performance.timing;
}

function getTimingInfo() {
    
}

$(document).ready(function(){
    console.log(new Date().getTime());
    timing = getTiming();
    
    console.log([
        timing.loadEventStart - timing.navigationStart,
        timing.domainLookupEnd - timing.domainLookupStart,
        timing.connectEnd - timing.connectStart,
        timing.responseStart - timing.requestStart,
        timing.responseEnd - timing.responseStart,
        timing.fetchStart - timing.navigationStart
    ]);
    console.log(timing.loadEventStart);
});