I am not quite sure about a method for a load timer, but you surely have a waiting spinner to let the user know that there is something happening and will load the page soon.
And the default behaviour of the visualization would be to show up a spinning circle while its loading. Is this not happening with your mashup?
Thanks for your reply.
Unfortunately the loading spinner is not working in my mashup. The qv placeholder just show empty while waiting objects to be loaded. So try looking for alternative method, like track get progress and enable overlay loading spinner while loading is happen. Kindly advice.