diff --git a/avisstage/models.py b/avisstage/models.py
index 0cd14d0..dfc06f1 100644
--- a/avisstage/models.py
+++ b/avisstage/models.py
@@ -14,12 +14,13 @@ from django.forms.widgets import DateInput
 from django.urls import reverse
 
 from django.utils import timezone
+from django.utils.functional import cached_property
 from django.utils.html import strip_tags
 
 from taggit_autosuggest.managers import TaggableManager
 from tinymce.models import HTMLField as RichTextField
 
-from .utils import choices_length, en_scolarite
+from .utils import choices_length
 from .statics import DEPARTEMENTS_DEFAUT, PAYS_OPTIONS, TYPE_LIEU_OPTIONS, TYPE_STAGE_OPTIONS, TYPE_LIEU_DICT, TYPE_STAGE_DICT, NIVEAU_SCOL_OPTIONS, NIVEAU_SCOL_DICT
 
 import ldap
@@ -51,9 +52,10 @@ class Normalien(models.Model):
     def stages_publics(self):
         return self.stages.filter(public=True).order_by('-date_debut')
 
-    @property
+    @cached_property
     def en_scolarite(self):
-        return en_scolarite(self.user_id)
+        return SocialAccount.objects.filter(user_id=self.user_id,
+                                            provider="clipper").exists()
 
     def has_nonENS_email(self):
         a = EmailAddress.objects.filter(user_id=self.user_id,
@@ -217,7 +219,11 @@ class Stage(models.Model):
     @property
     def niveau_scol_fancy(self):
         return NIVEAU_SCOL_DICT.get(self.niveau_scol, "")
-    
+
+    # Optimisation de requêtes
+    @cached_property
+    def all_lieux(self):
+        return self.lieux.all()
 
     def get_absolute_url(self):
         return reverse('avisstage:stage', self)
diff --git a/avisstage/templates/avisstage/detail/stage.html b/avisstage/templates/avisstage/detail/stage.html
index 4ef3c9d..bbe07e1 100644
--- a/avisstage/templates/avisstage/detail/stage.html
+++ b/avisstage/templates/avisstage/detail/stage.html
@@ -55,7 +55,7 @@
     {% endif %}
     <article class="stage">
         <section class="misc">
-            <div class="misc-content {% if object.lieux.all %}withmap{% endif %}">
+            <div class="misc-content {% if object.all_lieux %}withmap{% endif %}">
                 <div class="desc">
                     <div class="misc-hdr">
                         <h1>{{ object.sujet }}</h1>
@@ -65,8 +65,8 @@
                     a fait {{ object.type_stage_fem|yesno:"cette,ce" }} <b>{{ object.type_stage_fancy }}</b>
                         {% if object.niveau_scol %}{{ object.niveau_scol_fancy }},{% endif %}
                         {% if object.structure %}au sein de {{ object.structure }}{% endif %}{% if object.encadrants %}, supervisé par {{ object.encadrants }}{% endif %}.</p>
-                        {% if object.lieux.all %}<p>Cela s'est passé à : 
-                            {% for lieu in object.lieux.all %}{{ lieu.nom }} ({{ lieu.ville }}){% if not forloop.last %}, {% endif %}{% endfor %}.</p>
+                        {% if object.all_lieux %}<p>Cela s'est passé à : 
+                            {% for lieu in object.all_lieux %}{{ lieu.nom }} ({{ lieu.ville }}){% if not forloop.last %}, {% endif %}{% endfor %}.</p>
                         {% endif %}
                     
                     <ul class="infos">
@@ -79,12 +79,12 @@
                     </ul>
                 </div>
                 
-                {% if object.lieux.all %}
+                {% if object.all_lieux %}
                     <div class="map">
                         <div id="stage-map"></div>
                         <script type="text/javascript">
                          var lieux = [
-                             {% for lieu in object.lieux.all %}
+                             {% for lieu in object.all_lieux %}
                              {
                                  coord: {lat: "{{ lieu.coord.y|escapejs }}", lon: "{{ lieu.coord.x|escapejs }}" },
                                  popup: "<h3>{{ lieu.nom|escapejs }}</h3>" +
diff --git a/avisstage/utils.py b/avisstage/utils.py
index c1910cc..328f5c3 100644
--- a/avisstage/utils.py
+++ b/avisstage/utils.py
@@ -6,10 +6,5 @@ from functools import reduce
 def choices_length (choices):
     return reduce (lambda m, choice: max (m, len (choice[0])), choices, 0)
 
-def en_scolarite(user_or_id):
-    if isinstance(user_or_id, int):
-        user_id = user_or_id
-    else:
-        user_id = user_or_id.id
-    return SocialAccount.objects.filter(user_id=user_id,
-                                        provider="clipper").exists()
+def en_scolarite(user):
+    return user.profil.en_scolarite