In ArcGIS Online, when you look at an items Usage page (Requests), it defaults to requests made of that item within the last 24 hours. I frequently want to see that data over weeks or months. Upon changing the specified timeframe though, there is no clear indicator showing that the data is still loading or has finished loading - the chart sometimes goes blank and sometimes (like in my example below - usually just after opening) it continues to show the "No usage data" message (in this case for about 18 seconds).
It also continues to show the same number of item views previously returned. If this was only a couple of seconds, it wouldn't be a problem, but it can take quite a while for this data to refresh, and when I'm jumping between tabs and checking multiple items, I tend to mistake these as final stats before doing a double take.
IDEA: Add a loading symbol to the display on the Item > Usage > Requests page (in the chart space) when it is still recalling the required statistics.