[Anthony]

Outside of what we think of as hard sciences: they have a culture that has managed to cope with what we would see as insanely low growth rates. A 2.3% growth rate, which we consider reasonably healthy though not spectacular, is a factor of 10 increase in economy in a hundred years, which will put you at a type II civilization in about 1,000 years and a type III in another 1,000 years, and would consume the entire energy output of the observable universe in another 1,000 years. If they're 'only' a type II civilization in a million years, their growth rate is 0.0023%.