Drupal's big two issues are bootstrapping drupal, because all those module hooks stack up quick, and the sometimes large amount of queries run to generate a page. Drupal 8 has gotten better about not loading half of the world when a blog post is loaded, but 7 is just a wall of functions.
Drupal's big two issues are bootstrapping drupal, because all those module hooks stack up quick, and the sometimes large amount of queries run to generate a page. Drupal 8 has gotten better about not loading half of the world when a blog post is loaded, but 7 is just a wall of functions.