Hi, How fast is your internet connection? it chould change instantaniously. (cool notice: the currency value/calculation is updated daily from the FED website.)
Fast enough, I have cable modem. They started to change very quickly after a few minutes. While the site appeared to be completely loaded, however, the widget went blank after any change within the first few minutes. I got the same result in Firefox and Safari. It most definitely could have been a glitch in my connection, however if it affects me it will affect others too. Hence my suggestion for a loading indicator, it gives us something to watch the pass the time :)
Here are some example indicators:
http://images.google.com/images?client=safari&rls=en-us&...