diff --git a/backend/gn_module_import/conf_schema_toml.py b/backend/gn_module_import/conf_schema_toml.py
index 37e3988c..d95e4d99 100644
--- a/backend/gn_module_import/conf_schema_toml.py
+++ b/backend/gn_module_import/conf_schema_toml.py
@@ -156,3 +156,4 @@ class GnModuleSchemaConf(Schema):
     ID_LIST_TAXA_RESTRICTION = fields.Integer(load_default=None)
     MODULE_URL = fields.String(load_default="/import")
     DATAFRAME_BATCH_SIZE = fields.Integer(load_default=10000)
+    INSERT_BATCH_SIZE = fields.Integer(load_default=1000)
diff --git a/backend/gn_module_import/tasks.py b/backend/gn_module_import/tasks.py
index b4ef6d40..fa4c5789 100644
--- a/backend/gn_module_import/tasks.py
+++ b/backend/gn_module_import/tasks.py
@@ -168,7 +168,8 @@ def do_import_in_synthese(self, import_id):
             entity_source_pk_field=entity_source_pk_field.synthese_field,
             module=TModules.query.filter_by(module_code="IMPORT").one(),
         )
-    import_data_to_synthese(imprt)
+    for progress in import_data_to_synthese(imprt):
+        self.update_state(state="PROGRESS", meta={"progress": progress})
     ImportSyntheseData.query.filter_by(imprt=imprt).delete()
     imprt = TImports.query.with_for_update(of=TImports).get(import_id)
     if imprt is None or imprt.task_id != self.request.id:
diff --git a/backend/gn_module_import/utils.py b/backend/gn_module_import/utils.py
index 0cd76a5a..82694f65 100644
--- a/backend/gn_module_import/utils.py
+++ b/backend/gn_module_import/utils.py
@@ -5,6 +5,7 @@
 import json
 from enum import IntEnum
 from datetime import datetime, timedelta
+from math import ceil
 
 from flask import current_app, render_template
 from sqlalchemy import func
@@ -268,6 +269,10 @@ def update_import_data_from_dataframe(imprt, fields, df):
 
 
 def import_data_to_synthese(imprt):
+    """
+    Import prepared data in synthese.
+    Operate on batches, and yeld progress between each batch.
+    """
     generated_fields = {
         "datetime_min",
         "datetime_max",
@@ -302,11 +307,20 @@ def import_data_to_synthese(imprt):
         "id_dataset",
         "last_action",
     ]
-    insert_stmt = insert(Synthese).from_select(
-        names=names,
-        select=select_stmt,
-    )
-    db.session.execute(insert_stmt)
+    batch_size = current_app.config["IMPORT"]["INSERT_BATCH_SIZE"]
+    batch_count = ceil(imprt.source_count / batch_size)
+    for batch in range(batch_count):
+        min_line_no = batch * batch_size
+        max_line_no = (batch + 1) * batch_size
+        insert_stmt = insert(Synthese).from_select(
+            names=names,
+            select=select_stmt.filter(
+                ImportSyntheseData.line_no >= min_line_no,
+                ImportSyntheseData.line_no < max_line_no,
+            ),
+        )
+        db.session.execute(insert_stmt)
+        yield (batch + 1) / batch_count
 
 
 def generate_pdf_from_template(template, data):
diff --git a/frontend/app/components/import_process/import-step/import-step.component.html b/frontend/app/components/import_process/import-step/import-step.component.html
index d6eba4a8..cb0418ab 100644
--- a/frontend/app/components/import_process/import-step/import-step.component.html
+++ b/frontend/app/components/import_process/import-step/import-step.component.html
@@ -117,7 +117,7 @@ <h5 class="card-title mb-0">
                     class="d-flex flex-column justify-content-center align-items-center w-100 mb-3"
             >
                     <p> Import des données en cours</p>
-                    <mat-spinner [color]="color" [diameter]="50" class="upload-spinner"></mat-spinner>
+                    <mat-progress-bar [value]="progress"></mat-progress-bar>
             </div>
 
             <div class="d-flex flex-row justify-content-between progressBar" *ngIf="!importRunning">