Speedups to the post template

boards/templates/boards/post.html

@@ -42,7 +42,7 b''
                         ; return false;">&gt;&gt;</a>]
                 {% endif %}
                 {% if is_opening and need_open_link %}
-                    {% if post.thread_new.archived %}
+                    {% if thread.archived %}
                         [<a class="link" href="{% url 'thread' post.id %}">{% trans "Open" %}</a>]
                     {% else %}
                         [<a class="link" href="{% url 'thread' post.id %}#form">{% trans "Reply" %}</a>]
@@ -68,15 +68,17 b''
                     {{ post.text.rendered }}
                 {% endif %}
             {% endautoescape %}
-            {% if post.is_referenced %}
+            {% with refposts=post.get_sorted_referenced_posts %}
+                {% if refposts %}
                 <div class="refmap">
                     {% trans "Replies" %}:
-                    {% for ref_post in post.get_sorted_referenced_posts %}
+                        {% for ref_post in refposts %}
                     <a href="{{ ref_post.get_url }}">&gt;&gt;{{ ref_post.id }}</a
                                 >{% if not forloop.last %},{% endif %}
                     {% endfor %}
                 </div>
             {% endif %}
+            {% endwith %}
         </div>
     {% endcache %}
         {% if is_opening %}