Thank you Reg for the clear video! It is 100% percent what I experience also. At first I thought it was the one file, but soon enough I realized it was any files, just that the larger the quantity of parameters the slower it gets, up to 10s just like you showed.
I'm tempted to try an uninstall and reinstall of Inventor just in case it would fix it, but maybe we should find the issue, in case others have it too.
Would it be remnants of Inventor 2020? I've uninstalled 2020 already, so would it have taken some things with it? I don't know it wouldn't make sense. It worked fine for about 2 weeks and out of the blue it started doing this and I'm not even sure there were updates I made to it either... Yes I uninstalled all the add-ons without any success.
Very frustrating and puzzling! And to add to the puzzlement, we have 3 machines with Inventor, 2 of them act the same way (this slow business) but one seems to be fine (however I haven't given it a longer shot, just a one time try when it seemed to work normal - we only use that computer occasionally) Go figure....