2. Performance has little ambiguity

Another advantage of having performance as a set of numbers is its unambiguity.
When you want an animation to have a performance of 20 ms per frame or
50 fps, there’s little room for different interpretations about the numbers. On
the other hand, to describe the same animation in words, someone might call it
good, while someone else might complain that it’s bad. Similarly, the same
word or phrase could be interpreted differently by different people. You might
interpret an OK frame rate to be 60 fps, while someone else might interpret it
to be 30 fps.