Fix.

app/db.py

@@ -171,7 +171,7 @@ class Node:
                 nodes.append(n)
         return nodes
 
-
+    @cachetools.func.ttl_cache(maxsize=10, ttl=60)
     def back_links(self):
         return sorted([x.wikilink for x in nodes_by_outlink(self.wikilink)])
 

app/templates/node_rendered.html

@@ -54,6 +54,7 @@ Try listing all <a href="/nodes">nodes</a> or perhaps <a href="/search">search</
         <span class="subnode-id"><strong>Subnode</strong> <a href="/@{{subnode.user}}/{{node.uri}}">[[{{node.uri}}@{{subnode.user}}]]</a></span>
         <span class="subnode-links">by <a href="/@{{subnode.user}}">@{{subnode.user}}</a></span>
     </div>
+    <br />
 {{ subnode.render()|linkify|safe }}
 </div>
 {% endfor %}