Menampilkan Total Waktu Memuat Halaman

<div id="load-time">Calculating page load time...</div>
<script>
var showTime = document.getElementById('load-time'),
    startTime = (new Date()).getTime(); // Get the time before `window.onload`

window.onload = function() {
    // Get the current time in `window.onload`
    var endTime = (new Date()).getTime();
    // Now use the `startTime` and `endTime` to calculate the seconds
    // And show the result inside `#load-time`
    showTime.innerHTML = "Page load time = " + ((endTime-startTime)/1000) + " sec(s).";
};
</script>