models.py

class ArticlePage(Page):
  pass

class SectionPage(Page):
    # ...    
    def route(self, request, path_components):
        """
        Perform ORM optimisations on ArticlePage to speed up article load times
        """
        try:
            subpage = self.get_children_for_render().get(slug=path_components[0])
            return subpage.specific.route(request, path_components[1:])
        except (Page.DoesNotExist, Http404):
            pass


    def get_children_for_render(self):
        if self.is_leaf():
            return ArticlePage.objects.none()
        return (
            ArticlePage.objects.live().public()
            .select_related('author')
            .select_related('company')
            .select_related('company__logo')
            # Article body images
            .prefetch_related('images')
            .prefetch_related('images__renditions')
            # Equivalent to treebeard's mp_tree.MP_Node.get_children()
            .filter(
                depth=self.depth + 1,
                path__range=self._get_children_path_interval(self.path)
            )
        )