Silly benchmarks

casper_speed.js

var casper = require("casper").create();
var start = new Date().getTime();
var links = [
    "http://google.com/",
    "http://yahoo.com/",
    "http://bing.com/"
];

casper.start();

casper.each(links, function(self, link) {
    this.thenOpen(link, function() {
        var now = new Date().getTime();
        this.echo(link + ' loaded in ' + (now - start) + 'ms');
        start = now;
    });
});

casper.run();

casper_speed_results.log

http://google.com/ loaded in 3643ms
http://yahoo.com/ loaded in 12398ms
http://bing.com/ loaded in 1005ms

raw_phantom_speed.js

var links = [
    "http://google.com/",
    "http://yahoo.com/",
    "http://bing.com/"
];

var start = new Date().getTime();
var page = require('webpage').create();

page.open("http://google.com/", function() {
    var now = new Date().getTime();
    console.log('loaded google in ' + (now - start) + 'ms');
    start = now;
    page.open("http://yahoo.com/", function() {
        var now = new Date().getTime();
        console.log('loaded yahoo in ' + (now - start) + 'ms');
        start = now;
        page.open("http://bing.com/", function() {
            var now = new Date().getTime();
            console.log('loaded bing in ' + (now - start) + 'ms');
            start = now;
            phantom.exit();
        });
    });
});

raw_phantom_speed_results.log

loaded google in 4568ms
loaded yahoo in 10839ms
loaded bing in 1849ms

En tout cas, tout ceci est très lié à la qualité de la connectivité… Sinon essaye de désactiver le chargement des plugins et des images:

var casper = require('casper').create({
    pageSettings: {
        loadImages: false,
        loadPlugins: false
    }
});

Le chargement des images peut pas mal altérer le temps de chargement des pages… Yu peux aussi utiliser le cache du navigateur en passant l'option --disk-cache=yes:

$ casperjs --disk-cache=yes casper_speed.js

(l'astuce fonctionne aussi avec phantomjs)

casper: ``` casperjs ❯ casperjs casper_speed.js http://google.com/ loaded in 2191ms http://yahoo.com/ loaded in 7973ms http://bing.com/ loaded in 1127ms casperjs ❯ casperjs casper_speed.js http://google.com/ loaded in 1034ms http://yahoo.com/ loaded in 4935ms http://bing.com/ loaded in 747ms casperjs ❯ casperjs casper_speed.js http://google.com/ loaded in 1184ms http://yahoo.com/ loaded in 3853ms http://bing.com/ loaded in 924ms casperjs ❯ casperjs casper_speed.js http://google.com/ loaded in 1320ms http://yahoo.com/ loaded in 3242ms http://bing.com/ loaded in 704ms casperjs ❯ casperjs casper_speed.js http://google.com/ loaded in 1412ms http://yahoo.com/ loaded in 4360ms http://bing.com/ loaded in 904ms ``` phantom: ``` casperjs ❯ phantomjs raw_phantom_speed.js loaded google in 2402ms loaded yahoo in 8139ms loaded bing in 667ms casperjs ❯ phantomjs raw_phantom_speed.js loaded google in 760ms loaded yahoo in 4624ms loaded bing in 1261ms casperjs ❯ phantomjs raw_phantom_speed.js loaded google in 2014ms loaded yahoo in 5723ms loaded bing in 576ms casperjs ❯ phantomjs raw_phantom_speed.js loaded google in 633ms loaded yahoo in 3367ms loaded bing in 612ms casperjs ❯ phantomjs raw_phantom_speed.js loaded google in 1254ms loaded yahoo in 3450ms loaded bing in 560ms casperjs ❯ phantomjs raw_phantom_speed.js loaded google in 572ms loaded yahoo in 3286ms loaded bing in 572ms ```

casperjs ❯ casperjs --disk-cache=yes casper_speed.js
http://google.com/ loaded in 1196ms
http://yahoo.com/ loaded in 3492ms
http://bing.com/ loaded in 1362ms
casperjs ❯ casperjs --disk-cache=yes casper_speed.js
http://google.com/ loaded in 659ms
http://yahoo.com/ loaded in 2451ms
http://bing.com/ loaded in 911ms
casperjs ❯ casperjs --disk-cache=yes casper_speed.js
http://google.com/ loaded in 656ms
http://yahoo.com/ loaded in 2489ms
http://bing.com/ loaded in 751ms
casperjs ❯ casperjs --disk-cache=yes casper_speed.js
http://google.com/ loaded in 656ms
http://yahoo.com/ loaded in 2571ms
http://bing.com/ loaded in 730ms