The Retriever running 5 drones and two "Strip Miner I” will pull about "1241/60s or 20.5 m3/s” and the Porpoise with just the 5 drones (along with 3 augmented miner drone rigs) only pulls in "455/60s or 7.5 m3/s”.
I tried many different fittings but I can’t find anything much better. I can pull in quite a bit more with the Retriever (~50%) if I update to better mining lasers but then crystals come in to play and there is a lot more wasted ore (residue).
Keep in mind I did this without any of the other bonuses or boosting from the Porpoise as I’m not skilled into that yet. I doubt it makes up the difference though. That’s a pretty drastic gap.
Retriever +5 drones = 20.5 m3/s
Porpoise +5 drones = 7.5 m3/s
Unless they eventually give the Porp some turrets, I’m afraid it’s not really viable as a solo mining solution. I think it looks a lot cooler, but it’s just meant to be in a Fleet Support ship. However, If I end up mutil-boxing with an alt, that would be the way to go.