Ah, sorry, I was just referring to the construction of FHE itself as a breakthrough. Several steps have been made that make FHE more efficient, but there's stil

Ah, sorry, I was just referring to the construction of FHE itself as a breakthrough. Several steps have been made that make FHE more efficient, but there's still a ways to go. We're talking about fixed-size operations, so there's no notion of asymptotic expensiveness here, but yes, FHE "addition" and "multiplication" are very expensive.