Depending on your definition, this actually is not peak performance.

Subways are.

Obviously, the tunnels are absurdly expensive, but nothing moves as many people as quickly around a city as a subway.

They’re also extremely reliable, meaning people are even more likely to actually use them, and their above-ground footprint is essentially zero.

Neither is bigger. Even “∞ x ∞” is not bigger than “∞”. Classical mathematics sort of break down in the realm of infinity.

I don’t lock my phone to keep my SO off it.

I lock my phone to keep everyone off it.