I can remember reworking over and over the sequence that we loaded our DOS drivers into upper memory so that our compiled executable BASIC programs would run in the 640K lower memory.
In the early 90s I was working at Motorola in Huntsville, Al. In our Test Engineering department, we jumped from Packard-Bell 8088s to Gateway 486-DXs. It was like going from a Pinto to a Mustang GT.
My first home PC was a 1992 Gateway 486.
It didn’t take long to find out that I needed a second one so I could figure out haw to fix the first one when I made some s/w error.
I remember buying some software that took on that loading optimization task.