diff --git a/src/layertree/component.html b/src/layertree/component.html
index 66b7520914b0..5002dd256878 100644
--- a/src/layertree/component.html
+++ b/src/layertree/component.html
@@ -39,6 +39,7 @@
       <img
         ng-if="::(legendIconUrl=gmfLayertreeCtrl.getLegendIconURL(layertreeCtrl))"
         ng-src="{{::legendIconUrl}}"
+        loading="lazy"
       />
     </div>
   </a>