The file has a few drawings (curves, hatches) outside the viewport to the top right. When I open it, Rhino acts normally. But when I pan the view to the drawings, it freezes. The file and system info data are attached. Let me know if you can replicate it. Works fine in Rhino 6.
two things pop out of your systeminfo- your os is 11.1, please update to 11.3 and your rhino is 7.2- please update to 7.9
let us know if these two updates fix your issues.
Yes, all fine now. I guess an extra dense hatch was causing the problem.