Are you sure? I mean have you done a real test with an independent observer using a stopwatch? Back in the 1980s Apple did run those tests and were able to setup many situations where an experience keyboard user was still faster with a mouse - but they all claimed to be faster with the keyboard. Now to some extent they were gaming the tests (not all situations where realistic), but enough were that we can confidently say that the mouse often is faster even when it feels slower.