title: Why is Urlopen slow on some websites
body: <p>I am trying to read a simple text from a Website.
  It is working but the speed is the problem.</p>
  
  <p>Any request to that website takes about 20 seconds to get a response. Other websites are fast. With the Browser or the "same" request in Matlab that specific Website is responding immediately:</p>
  
  <pre><code>&gt;&gt;from urllib.request import urlopen
  &gt;&gt;url = "http://live.glidernet.org/lxml.php?a=0&amp;b=50.5&amp;c=49.5&amp;d=15.2&amp;e=10&amp;z=2" 
  &gt;&gt;urlopen (url)
  </code></pre>
  
  <p>Why is <code>urlopen</code> slow on some websites?</p>