Moving 48 units in a periodic event isnt a big deal, if you make it efficient.
_________________________
What you also could do is to create several levels for this ability what I posted, and only one indication circle.
Then make hotkey "R" for example. So when ever user presses "R", range indicator changes would it's radius, and also displays the current value. (depending of current level of ShowRange-ability)
After several uses it should get back to minimum range indication again.
_________________________
MUI and smooth range indication could be something for our spell section maybe..