title: Why updating of dependencies in composer is so slow?
body: <p>I am using composer (<a href="http://getcomposer.org/">http://getcomposer.org/</a>) to manage installed bundles in the <code>Symfony2</code> (symfony v 2.1.3). Version of the composer is <code>de3188c</code>. </p>
  
  <p>I have problem that when I add new bundle into the composer.json and execute it the time to show messages about Updating dependencies and next downloading them all is very low. </p>
  
  <p>I have this data in the composer.json (see below) and the executing time is approximately 20 MINUTES!!! The internet connection is fast enough I can download big files very fast...</p>
  
  <p>Is there any trick to make it faster?</p>
  
  <pre><code>{
  "name": "symfony/framework-standard-edition",
  "description": "The \"Symfony Standard Edition\" distribution",
  "autoload": {
      "psr-0": { "": "src/" }
  },
  "require": {
      "php": "&gt;=5.3.3",
      "symfony/symfony": "2.1.*",
      "doctrine/orm": "&gt;=2.2.3,&lt;2.4-dev",
      "doctrine/doctrine-bundle": "1.0.*",
      "twig/extensions": "1.0.*",
      "symfony/assetic-bundle": "2.1.*",
      "symfony/swiftmailer-bundle": "2.1.*",
      "symfony/monolog-bundle": "2.1.*",
      "sensio/distribution-bundle": "2.1.*",
      "sensio/framework-extra-bundle": "2.1.*",
      "sensio/generator-bundle": "2.1.*",
      "jms/security-extra-bundle": "1.2.*",
      "jms/di-extra-bundle": "1.1.*",
      "doctrine/doctrine-fixtures-bundle": "dev-master",
      "webignition/doctrine-migrations-bundle": "dev-master"
  },
  "scripts": {
      "post-install-cmd": [
          "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
          "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
          "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
          "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile"
      ],
      "post-update-cmd": [
          "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
          "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
          "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
          "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile"
      ]
  },
  "minimum-stability": "dev",
  "extra": {
      "symfony-app-dir": "app",
      "symfony-web-dir": "web"
  }
  </code></pre>