diff --git a/src/agenda_culturel/models.py b/src/agenda_culturel/models.py
index b9333de..1bac81d 100644
--- a/src/agenda_culturel/models.py
+++ b/src/agenda_culturel/models.py
@@ -1625,6 +1625,8 @@ class CategorisationRule(models.Model):
         blank=True,
     )
 
+    rules = None
+
     class Meta:
         verbose_name = _("Categorisation rule")
         verbose_name_plural = _("Categorisation rules")
@@ -1641,9 +1643,10 @@ class CategorisationRule(models.Model):
             return 1
 
     def get_category_from_rules(event):
-        rules = CategorisationRule.objects.all().order_by("weight", "pk")
+        if CategorisationRule.rules is None:
+            CategorisationRule.rules = CategorisationRule.objects.all().order_by("weight", "pk").prefetch_related("category").prefetch_related("place")
 
-        for rule in rules:
+        for rule in CategorisationRule.rules:
             if rule.match(event):
                 return rule.category
 
diff --git a/src/agenda_culturel/views.py b/src/agenda_culturel/views.py
index 9dc456f..bd16a2a 100644
--- a/src/agenda_culturel/views.py
+++ b/src/agenda_culturel/views.py
@@ -1730,7 +1730,8 @@ def apply_categorisation_rules(request):
     else:
         # first we check if events are not correctly categorised
         to_categorise = []
-        for e in Event.objects.filter(start_day__gte=datetime.now()).exclude(category=Category.get_default_category_id()).exclude(category=None):
+        events = Event.objects.filter(start_day__gte=datetime.now()).exclude(category=Category.get_default_category_id()).exclude(category=None).prefetch_related("exact_location").prefetch_related("category")
+        for e in events:
             c = CategorisationRule.get_category_from_rules(e)
             if c and c != e.category:
                 to_categorise.append((e, c))
@@ -1738,7 +1739,8 @@ def apply_categorisation_rules(request):
         # then we apply rules on events without category
         nb = 0
         to_save = []
-        for e in Event.objects.filter(start_day__gte=datetime.now()).filter(Q(category=Category.get_default_category_id()) | Q(category=None)):
+        events = Event.objects.filter(start_day__gte=datetime.now()).filter(Q(category=Category.get_default_category_id()) | Q(category=None)).prefetch_related("exact_location").prefetch_related("category")
+        for e in events:
             success = CategorisationRule.apply_rules(e)
             if success:
                 nb += 1