This is always rather ambiguous terminology. For some people, it makes no sense for thing a to be more than 100% faster than thing b. Other people see it clearly meaning that thing a take half the time of thing b.
What we really want to measure is time quantities rather than speed quantities. I find comparisons of time much easier to grasp than comparisons of speed.
What we really want to measure is time quantities rather than speed quantities. I find comparisons of time much easier to grasp than comparisons of speed.