What is it? Is it just a new term for making people do more than one job? The old “speedup”? Old wine in new bottles?

This is an old computer processing term, it meant getting the computer to work on more than one process at a time. In these computer hip, a PC in every pot days it has transferred over to refer to a person who can juggle several things at a time, like talking on the cellphone while driving or watching TV, ironing and cooking dinner simultaneously.

I would guess the term is probably at least 30-40 years old, just recently has come into day to day use.