Theoretically you'd be running each of the 256 workers at 1,000,000x speed already. The boss goes into 21,000,000x speed, but has to pay a non-linear cost for that so you can only have one person at that speed. It would require a very particular price/speed discrimination structure to make that viable though.

The other option is that you're in a job that needs 256 different skill sets and we haven't learned how to swap out parts of people's personality yet. Eg, you're translating a book into 256 languages and each person only knows 1 language.

Although neither scenario strikes me as particularly likely.