title: Pulling down plugin from cordova plugin repository is very slow on one machine
body: <p>On my Mac, pulling down a Cordova plugin through npm is excruciatingly slow, taking upwards of a minute:</p>
  
  <pre><code>cordova plugin add cordova-plugin-splashscreen
  </code></pre>
  
  <p>However, if I use the git URL then it is as quick as anything, taking around 5 seconds:</p>
  
  <pre><code>cordova plugin rm cordova-plugin-splashscreen
  cordova plugin add https://github.com/apache/cordova-plugin-splashscreen.git
  </code></pre>
  
  <p>This is repeatable any number of times, so I don't think it's to do with local caching.</p>
  
  <p>Other npm commands seem to return normally, eg this takes about a second as well:</p>
  
  <pre><code>npm install lodash
  </code></pre>
  
  <p>Other people, also using a Mac on the same network, don't have this problem.</p>
  
  <p>Any ideas what could be causing this?</p>