Untitled

Javacscript: Calculating the time required to retrieve data
$.post("test.php", function(data) {
   //do something with data
 });

var start = new Date().getTime();

$.post("test.php", function(data) {
   //do something with data

   var end = new Date().getTime();

   alert((end - start) + ' milliseconds passed');
});

var before = new Date();
$.post("test.php", function(data) {
   var timeTook = new Date() - before;
 });

var start = Date.now();

$.post("test.php", function(data) {
    alert(Date.now() - start);
});

if (!Date.now)
    Date.now = function() {
        return +(new Date);
    };

var start = new Date();

var end = new Date();
alert(end - start);