Loaded 7 eval on a smaller Windows 10 machine (8 gig ram i5 processor) and it was painfully slow. I was creating a simple line and it took over 20 seconds to add each point. Not sure what 7 might be doing, but I deleted all recent software updates related to 7. Got my performance back. My most powerful machine is running Windows 7 Pro, so I can’t load 7 there. I could upgrade, but it seems like more trouble than I really need to go to right now.
Type in “systeminfo” command in Rhino and copy/paste the results here. We can take a look to see what might be happening.