firewall: add queryset optimalizations

circle/firewall/admin.py

@@ -25,6 +25,10 @@ class HostAdmin(admin.ModelAdmin):
     filter_horizontal = ('groups', )
     inlines = (RuleInline, RecordInline)
 
+    def queryset(self, request):
+        qs = super(HostAdmin, self).queryset(request)
+        return qs.prefetch_related('groups')
+
     @staticmethod
     def list_groups(instance):
         """Returns instance's groups' names as a comma-separated list."""

circle/network/views.py

@@ -503,6 +503,11 @@ class RuleList(LoginRequiredMixin, SuperuserRequiredMixin, SingleTableView):
     template_name = "network/rule-list.html"
     table_pagination = False
 
+    def get_table_data(self):
+        return Rule.objects.select_related('host', 'hostgroup', 'vlan',
+                                           'vlangroup', 'firewall',
+                                           'foreign_network', 'owner')
+
 
 class RuleDetail(LoginRequiredMixin, SuperuserRequiredMixin,
                  SuccessMessageMixin, UpdateView):