Apologies for the lack of reply, as we say that if you have support queries please email them to us so we can track them and are aware quickly of those which are still pending. Queries via the forum are harder to track and easily get lost if lots of other posts and during different shifts as in this case.
While RadarBox is running can you run the task manager and show us whats the highest CPU process and your memory please? It really shouldn't be slow on your machine, of course if you set all the 3D settings to full it will take a lot of resources.