increase timeout for slow connection

renderjs.js

@@ -605,7 +605,7 @@
       iframe_loading_deferred.promise,
       // Timeout to prevent non renderJS embeddable gadget
       // XXX Maybe using iframe.onload/onerror would be safer?
-      RSVP.timeout(5000)
+      RSVP.timeout(500000)
     ]);
   }