Slow and balky like the file is too big

I was using the new Rhino 7–I certainly like that you can trim hatches–lovely. I have been working on a file for several days since downloading the new WIP–but today, it became slow…and balky like the file was too big…I tried save and shut down–both the program and then again with a restart to my mac but it didn’t affect the slowness. It felt like a pre-crash.

I continue to experience the balky, slow response even with the latest cut. By the way I should have said I am running Catalina 10.15.4–BETA.