I had been running my personal blog on Drupal since the 4.7 days, having moved from WordPress myself, so I was already aware of a noticeable performance increase plus a greater framework in which to expand upon. This instantly put Drupal ahead of the rest. I then decided to confirm through a series of tests. I setup default installations of WordPress 2.3 and Drupal 5. I only enabled the core caching mechanisms in both setups and populated them with the exact same data and display options. Both systems also used the default themes and features. After running a series of tests through JMeter, I quickly confirmed my beliefs and even exceeded them as I saw Drupal was able to handle about eight times the requests per second as WordPress, both on the front page and the same single post view with 157 comments.
any response from WP community?