Fire all your workers except a couple drones and build drone hubs instead.
I'd like some more information, how are drones better than cleaners and sorters?
what do the drone hubs do?
and I'll repeat what does "auto" as a designation do?
what is a 'couple' drones? is it 1 per X regions?
you're severely underestimating how much a million and a half were at the end game, it was hours of just idling when active play was a decently paced incremental up till then.
after some of my own testing: drone hubs can only be upgraded to when under 20 contamination and the drones seem to automatically move between places with hubs so now I have 15 drones for the 36 hubs, probably way overkill.
Still don't know what the sorter really does. Or if (drone) cleaners have zero use after a certain point.