How to improve CDN on a drupal site? I'm checking a drupal site with YSlow and I get a "Grade E on Use a Content Delivery Network (CDN)" with this message: 


  "There are 43 static components that are not on CDN."


Just wondering if the cdn will help to improve this situation.
It will only help if your files are actually on a CDN...if they are, then install that module, set it up, and you should see some performance benefits. 

If not, then installing it will have zero effect, except to add a very slight extra overhead to your page build (when the module is included/hooks are run/etc).