general: do not preload tile cells when rendering page (#54592)

combo/data/models.py

@@ -869,6 +869,7 @@ class CellBase(six.with_metaclass(CellMeta, models.Model)):
         prefetch_validity_info=False,
         select_related=None,
         load_contenttypes=False,
+        cells_exclude=None,
         **kwargs,
     ):
         """Returns the list of cells of various classes matching **kwargs"""
@@ -904,6 +905,8 @@ class CellBase(six.with_metaclass(CellMeta, models.Model)):
             if cell_filter and not cell_filter(klass):
                 continue
             cells_queryset = klass.objects.filter(**kwargs)
+            if cells_exclude:
+                cells_queryset = cells_queryset.exclude(cells_exclude)
             if extra_filter:
                 cells_queryset = cells_queryset.filter(extra_filter)
             if select_related:

combo/public/views.py

@@ -27,6 +27,7 @@ from django.contrib.auth.models import User
 from django.core import signing
 from django.core.exceptions import ObjectDoesNotExist, PermissionDenied
 from django.db import transaction
+from django.db.models import Q
 from django.forms.widgets import Media
 from django.http import (
     Http404,
@@ -567,7 +568,10 @@ def publish_page(request, page, status=200, template_name=None):
             return HttpResponseRedirect(redirect_url)
 
     cells = CellBase.get_cells(
-        page=page, select_related={'data_linkcell': ['link_page']}, prefetch_validity_info=True
+        page=page,
+        select_related={'data_linkcell': ['link_page']},
+        prefetch_validity_info=True,
+        cells_exclude=Q(placeholder__in=['_auto_tile', '_dashboard', '_suggested_tile']),
     )
     extend_with_parent_cells(cells, hierarchy=pages)
     cells = [x for x in cells if x.is_visible(user=request.user)]