Log start time, end time, and duration for requests using phantomjs. Also print out the average request durations. You should probably modify it a bit to make sure it exits under whatever conditions make the most sense for you. Run like: phantomjs loadTiming.js http://www.google.com

loadTiming.js

var page = require('webpage').create(),
    system = require('system'),
    startTime, address, requestStartTimes, requestDurations;

if (system.args.length === 1) {
    console.log('Usage: netlog.js <some URL>');
    phantom.exit(1);
} 

address = system.args[1];

var getTimePassed = function() {
    return Date.now() - startTime;
};

var displayUrl = function(url) {
    return url.indexOf('data:') === 0? 'dataURI' : url.split("?")[0];
}

var fromHost = function(url) {
    return url.indexOf(address) === 0;
};

requestStartTimes = {};
requestDurations = {fromHost:{}, external: {}};

var getAverageDuration = function(durations) {
    var total = 0.0;
    var numRequests = 0.0;
    for (key in durations) {
        numRequests ++;
        total += durations[key];
    }
    return parseInt(parseFloat(total) / parseFloat(numRequests));
};

page.onResourceRequested = function (req) {
    var time = getTimePassed();
    requestStartTimes[req.id] = time;
    console.log(time+'ms req #'+req.id+': ' + displayUrl(req.url));
};

page.onResourceReceived = function (res) {
    var time = getTimePassed();
    var duration = time - requestStartTimes[res.id];
    var host = fromHost(res.url)? 'fromHost' : 'external';
    requestDurations[host][res.id] = duration;
    console.log(time+'ms res #'+res.id+' dur: '+duration+'ms : ' +displayUrl(res.url));
};

page.onInitialized = function() {
    console.log(getTimePassed()+'ms page initialized.');
    var onReady = function(start) {
        var getTimePassed = function() {
            return Date.now() - start;
        };
        document.addEventListener('DOMContentLoaded', function() {
            console.log('DOMContentLoaded.');
        }, false);
    };
    page.evaluate(onReady,startTime);
};

page.onConsoleMessage = function(message) {
    if (message.indexOf('DOMContentLoaded') >= 0) {
        console.log('');
        console.log(getTimePassed()+'ms '+message);
        console.log('');
    } else if (message.indexOf('rendered mainContent template') >= 0) {
        console.log('');
        console.log(getTimePassed()+'ms '+message);
        console.log('');
        console.log('avg request duration from host: '+getAverageDuration(requestDurations['fromHost'])+'ms');
        console.log('avg external request duration: '+getAverageDuration(requestDurations['external'])+'ms');
        phantom.exit();        
    }
};

page.onLoadStarted = function() {
    console.log('');
    console.log(getTimePassed()+'ms load started.');
    console.log('');
};

startTime = Date.now();
page.open(address, function (status) {
    if (status !== 'success') {
        console.log('FAIL to load the address');
        phantom.exit();
    } else {
        console.log('');
        console.log(getTimePassed() + 'ms FINISHED LOADING.');    
    }
});