Forums: pre-select all the user profiles when displaying a topic. As it was, the template was calling get_user_profile which was causing a db hit on every post in the topic.

{% if show_button %}
<a href="{% url forums-edit_post id=post.id %}"><img src="{{ MEDIA_URL }}icons/page_edit.png" alt="Edit post" title="Edit post" /></a>
{% endif %}