Define horribly inefficient please:
Assuming the space I have for my reactors (that fit perfectly in it) I have an empty room of 108000 blocks, which is 2.7 million/s after hitting the softcap. Now I can fit exactly 14 reactors in that space, can't even put a space hamster between them... Each reactor gives 1 million/s in theory, 950K is more close to it.
That's a nice ratio but that's even less than I mentioned, please give me an example of one of your very efficient ships.
and my reactors are 6000 blocks for 1 million regen + supply, no shields.