For instance Strength/Size*Speed, where size and speed refer to memory and processing.
We now have very strong, narrow AI, but they tend to run on fast hardware without volume restrictions.
To understand why I'm asking, this article on BBC may provide some insight: "Which life form dominates Earth?" (If I was a betting man, I'd put money on tardigrades outlasting humans, and the secret of their success is that they require minimal resources and processing power, unlike higher-order automata.)