There is already a animating progress bar when the graph data is being loaded. The animation, however, will not play (same for everything else on the page) while the graph is being generated/rendered since the main thread of the browser is being occupied. I don't think this is fixable (without a long period of time playing with experimental technology that may not work across all browsers).
There is already a animating progress bar when the graph data is being loaded. The animation, however, will not play (same for everything else on the page) while the graph is being generated/rendered since the main thread of the browser is being occupied. I don't think this is fixable (without a long period of time playing with experimental technology that may not work across all browsers).