The UCSD system was indeed astonishingly, unusably slow. When I got to try it in high school computer lab, in the 80s, I was like "Did whoever ported it to this particular computer just totally fuck it up? WTF?!"

An Infocom adventure on a machine with 16k RAM also had frequent pauses to fetch from floppy, but it was much more tolerable.

Re verb lookups in Basic: you could use DATA statements and READ in a FOR loop for lookup. I don't know what was typical but that's what I recall from some examples.