CPU spikes during move of GoIconicNodes

I have a view with several hundred nodes displayed (No links currently). When I move nodes the CPU spikes to 90-100% and it takes a few seconds to return response back to the user. It doesn’t always happen with the first node moved. Sometimes I can move 1 or 2 and then the 3rd nodes takes a while to return control.
Is there anything I can do to increase performance? I’m using version 2.1.2 of GoDiagram.