T17 strongboxes, ~250k gold per hour

You can run any T17, but Ziggurat drops the most expensive fragments, maybe abomination could be better.

You can use any cheap delirium orbs, they are only needed for packsize.

Roll maps for 100%+ combined more scrabs and more currency.

Use Ambush option on the map device.

Clear the map before the boss first to disable the spawning of altars with boss rewards. Then clear the map completely.

I complete one map in ~14 minutes, but you can complete them faster.