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It’s simply not possible to make a blanket statement like this. Computers today are so very different and have so many more layers than those from 1983.

I recently refurbished an old Mac Plus. Of course I couldn’t leave it stock, booting from floppies was simply too ridiculous.. So it boots from Zip. Anyways, once I had this machine up and running I was quite surprised at how snappy the interface is - once everything was in place - and that’s the difference. The old interface is paper thin and has nothing going on, no asynchronous, little to no threads, it is just what it is.