getPerf.js

var timing = performance.timing;
var requestEntries = performance.getEntries();
var perfData = {
	PageName: window.location.pathname,
	JSFilesCount: requestEntries.filter(function(element){return element.name.indexOf('.js')> -1;}).length,
	CSSFilesCount: requestEntries.filter(function(element){return element.name.indexOf('.css')> -1;}).length,
	FilesCount: requestEntries.length + 1,
	TimeToFirstByte: timing.responseStart - timing.navigationStart,
	TimeToDOMContentLoad: 
	timing.domContentLoadedEventEnd - timing.navigationStart,
	TimeToFirstPaint: Math.round((window.chrome.loadTimes().firstPaintTime * 1000) - (window.chrome.loadTimes().startLoadTime * 1000)),
	TimeToLoad: timing.loadEventEnd - timing.navigationStart,
	IsFirstLoad: requestEntries.filter(function(element){return element.duration == 0;}).length == 0 ? 1 : 0,
	LoadDuration: timing.loadEventEnd - timing.loadEventStart
}