Track XMLHttpRequest (better version here: https://gist.github.com/clamiax/7325ca5c075d954dc61406d7e0cdc7aa)

trackxhr

function trackxhr() {
        var xhrsend = XMLHttpRequest.prototype.send;
        XMLHttpRequest.prototype.send = function() {
                var onready = this.onreadystatechange;
                console.log('XHR', 'sending...');
                this.onreadystatechange = function() {
                        if(this.readyState == 4)
                                console.log('XHR', 'done');
                        if(onready)
                                onready.apply(this, arguments);
                };
                xhrsend.apply(this, arguments);
        };
}