5-10 minutes for full resolution map loading

I am no stranger to large maps being blurry upon loading but usually after one or two minutes they will settle at their original resolution. But right now I have to wait more than 5 minutes to get to this final stage with some interpolated version between the pre-load and final version being present for several minutes. Is this a server load problem? Or a new "feature"? This seems to have been introduced with the latest GUI update.

Could be server load, or the number of objects on screen that also need rendering, or general internet traffic, or any number of other things. What is the native size of the map image? Five minutes is a little on the long side, certainly.