title: Determine Internet Speed
body: <p>Is there a way my app (OS X, 10.7 target) can determine the internet connection speed <strong>without downloading a file</strong>? All the other questions here seem to be downloading files. My app is a menu bar app, so downloading a file every so often seems really inefficient (even if small). </p>
  
  <p>Any ideas? Can I just passively watch incoming bytes on the system? If so, what frameworks do I need to look into?</p>