diff --git a/froide/foirequest/templates/foirequest/attachment/show.html b/froide/foirequest/templates/foirequest/attachment/show.html
index 093248e1b..e19bf4be3 100644
--- a/froide/foirequest/templates/foirequest/attachment/show.html
+++ b/froide/foirequest/templates/foirequest/attachment/show.html
@@ -60,7 +60,7 @@ <h2>{% blocktrans with name=attachment.name %}Attachment “{{ name }}”{% endb
 {% if attachment.can_embed %}
   {% if attachment.is_pdf %}
     <div class="container-sm-full d-none d-md-block">
-      <iframe src="{{ attachment_url }}" frameborder="0" style="width: 100%; height: 90vh; border: 0;">
+      <iframe src="{{ attachment_url }}" frameborder="0" style="width: 100%; height: 90vh; border: 0;" loading="lazy">
       </iframe>
     </div>
     <div class="container d-block d-md-none text-center">