If I change the period to show 5 days of history, it takes a good few seconds to load it where there is no indication that it’s actually doing anything; i can interact with the chart as per normal, add x-traces, zoom, etc. and then “poof!” it loads the data magically. If I set it to 20 days, it takes a good 35+s. It would be nice if there was a loading icon animation.
Every Component need a loading icon animation, maybe a label bind with a web client, that need few seconds too. I use scripts whenever possible, show a picture before query and hide after.
have you found any solution for this
My post was my solution 
Just submitted a Feature request to expose a property which becomes true when data is loading or better yet natively include an indicator in Power Chart. Thought I'd reply here since this post is pretty old. If there is already a solution, let me know please and I'll pull down the feature request.