Limit the rendering resolution

public/ar_main.js

@@ -1076,6 +1076,11 @@ async function activateXR(
             context: gl
         });
 
+        renderer.setPixelRatio(
+            math.min(
+                window.devicePixelRatio, 1.5
+            )
+        ); 
 
     renderer.autoClear = false;