title: selenium webdriver takes too long to load a page
body: <p>I use PhantomJS as my webdriver. Sometimes it takes too long to load a webpage but I don't know why</p>
  
  <pre><code>import time
  from selenium import webdriver
  from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
  
  dcap = dict(DesiredCapabilities.PHANTOMJS)
  dcap["phantomjs.page.settings.userAgent"] = 'Mozilla/5.0 (Windows NT 10.0;  WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36'
  driver = webdriver.PhantomJS(service_args=['--load-images=no'], desired_capabilities=dcap)
  t=time.time()
  driver.get('http://www.tibetculture.net/2012zyzy/zx/201509/t20150915_3939844.html')
  print 'Time consuming:', time.time() - t
  </code></pre>
  
  <p>It took about 86s to load the page. In a browser, the webpage can be loaded in several seconds and I have no idea why webdriver PhantomJS takes such a long time. What's wrong with it?</p>