diff --git a/kfet/views.py b/kfet/views.py
index 2c4a4f73..cfc58aa0 100644
--- a/kfet/views.py
+++ b/kfet/views.py
@@ -2219,10 +2219,13 @@ class AccountStatBalance(PkUrlMixin, JSONDetailView):
         # prepare querysets
         # TODO: retirer les opgroup dont tous les op sont annulées
         opegroups = OperationGroup.objects.filter(on_acc=account)
-        recv_transfers = Transfer.objects.filter(to_acc=account,
-                                                 canceled_at=None)
-        sent_transfers = Transfer.objects.filter(from_acc=account,
-                                                 canceled_at=None)
+        transfers = (
+            Transfer.objects
+            .filter(canceled_at=None)
+            .select_related('group')
+        )
+        recv_transfers = transfers.filter(to_acc=account)
+        sent_transfers = transfers.filter(from_acc=account)
 
         # apply filters
         if begin_date is not None:
@@ -2250,13 +2253,11 @@ class AccountStatBalance(PkUrlMixin, JSONDetailView):
         actions.append({
             'at': (begin_date or account.created_at).isoformat(),
             'amount': 0,
-            'label': 'début',
             'balance': 0,
         })
         actions.append({
             'at': (end_date or timezone.now()).isoformat(),
             'amount': 0,
-            'label': 'fin',
             'balance': 0,
         })
 
@@ -2264,21 +2265,18 @@ class AccountStatBalance(PkUrlMixin, JSONDetailView):
             {
                 'at': ope_grp.at.isoformat(),
                 'amount': ope_grp.amount,
-                'label': str(ope_grp),
                 'balance': 0,
             } for ope_grp in opegroups
         ] + [
             {
                 'at': tr.group.at.isoformat(),
                 'amount': tr.amount,
-                'label': str(tr),
                 'balance': 0,
             } for tr in recv_transfers
         ] + [
             {
                 'at': tr.group.at.isoformat(),
                 'amount': -tr.amount,
-                'label': str(tr),
                 'balance': 0,
             } for tr in sent_transfers
         ]