We are experiencing excessive pinwheeling too - switching back to AC27 from other programs, as well as generally working (opening views, closing dialogues, panning/zooming, selecting). In some cases it's "only" 15-30 seconds, but in others it's many ...

There are a lot of other steps, make sure you do all of them in order. https://assets.graphisoft.com/guides/AI_Visualizer/AI_Visualizer-Installation_Guide.pdf