Try adding an index to speed up things

itou/users/migrations/0021_user_full_name.py

@@ -0,0 +1,19 @@
+# Generated by Django 5.1.4 on 2025-01-10 14:18
+
+import django.contrib.postgres.search
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('users', '0020_make_unnaccent_immutable'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='user',
+            name='full_name',
+            field=models.GeneratedField(db_persist=True, expression=django.contrib.postgres.search.SearchVector('first_name', 'last_name', config='simple'), output_field=django.contrib.postgres.search.SearchVectorField(), verbose_name='nom complet utilisé pour rechercher un utilisateur'),
+        ),
+    ]

itou/users/migrations/0022_user_full_name_search_idx.py

@@ -0,0 +1,20 @@
+# Generated by Django 5.1.4 on 2025-01-10 14:19
+
+import django.contrib.postgres.indexes
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('auth', '0012_alter_user_first_name_max_length'),
+        ('cities', '0001_initial'),
+        ('users', '0021_user_full_name'),
+    ]
+
+    operations = [
+        migrations.AddIndex(
+            model_name='user',
+            index=django.contrib.postgres.indexes.GinIndex(models.F('full_name'), name='full_name_search_idx'),
+        ),
+    ]

itou/users/models.py

@@ -7,13 +7,15 @@
 from citext import CIEmailField
 from django.conf import settings
 from django.contrib.auth.models import AbstractUser, UserManager
-from django.contrib.postgres.indexes import OpClass
+from django.contrib.postgres.indexes import GinIndex, OpClass
+from django.contrib.postgres.lookups import Unaccent
+from django.contrib.postgres.search import SearchVector, SearchVectorField
 from django.core.exceptions import ValidationError
 from django.core.serializers.json import DjangoJSONEncoder
 from django.core.validators import MaxLengthValidator, MinLengthValidator, RegexValidator
 from django.db import models
 from django.db.models import Count, Q
-from django.db.models.functions import Upper
+from django.db.models.functions import Concat, Upper
 from django.urls import reverse
 from django.utils import timezone
 from django.utils.crypto import salted_hmac
@@ -170,6 +172,12 @@ class User(AbstractUser, AddressMixin):
         default="",
         choices=Title.choices,
     )
+    full_name = models.GeneratedField(
+        expression=SearchVector("first_name", "last_name", config="simple"),
+        output_field=SearchVectorField(),
+        verbose_name="nom complet utilisé pour rechercher un utilisateur",
+        db_persist=True,
+    )
 
     email = CIEmailField(
         "adresse e-mail",
@@ -231,7 +239,8 @@ class Meta(AbstractUser.Meta):
             models.Index(
                 OpClass(Upper("email"), name="text_pattern_ops"),
                 name="users_user_email_upper",
-            )
+            ),
+            GinIndex("full_name", name="full_name_search_idx"),
         ]
         constraints = [
             models.CheckConstraint(