Quantum Tunneling Is Not Instantaneous, Physicists Show

> They also verified another strange prediction of quantum mechanics: the lower the energy, or slower the movement, of a tunneling particle, the less time it spends in the barrier. This result is counterintuitive, because in our everyday notion of how the world works, a slower particle would be expected to remain in the barrier for a longer stretch of time.

This seems to make intuitive sense to me, given the “peak of the wave function” explanation offered earlier in the article for why particles arrive faster if they tunnel. For a higher-energy particle, it is more determined which way (and with which velocity) it's headed, so its future is more certain (the space of possible states is narrower). IANAQP