Single player loading times are pretty awful for me, and my PC isn't that old (Ryzen 5 2600, AMD 5700).
I tried some Pindle runs and it was just too painful.
However I have started fresh so I am not switching back to old D2 for MF or bringing any items forward. I will probably just MF differently Pit runs, WSK/Baal runs etc. Although I'm not grailing.