title: Drupal 7 programming advancements, differences from Drupal 6 upgrade or wait
body: <p>I was just wondering if there were any changes in the Drupal 7 code that effect server load and speed for large sites.</p>
  
  <p>Also, with 7 nearing beta release, should I wait to build the sites with Drupal 7? I'm a future kinda guy. I would like to be able to develop Drupal sites for a freelance business I am owner of, and would like to start soon. Is Drupal 7 accepted enough to be developing live, customer sites for? Security Issues?</p>
  
  <p>Thanks</p>