Program wont work

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Just bought the paid verssion of HeeksCAD. Just moving mouse inside model area puts my GPU maxed out. Scrolling is completely unresponsive. Rotating the model is unusable and unresponsive.

I attached a pic of the model. Its not much. My other 3d modeling software gives me no problems on the same computer. Ive experienced no problems on this computer whatsoever with any 3d modeling Ive thrown at it in the past 5 years. How could a dinky 2d model cause my computer to be maxed out? Its so much less information to handle

GPU is Intel HD Graphics 520

The strange thing is my computer will handle this and other models some times. The program will do everything i need it to with no problems. Other times, the same .dxf that was working an hour ago will now max out my computer completely after no changes have been made to the .dxf. Kinda hard to explain how that's possible. No other processes are consuming much GPU resources. Any suggestions?