How slow is slow?

Well, this can be classed in three categories.

Vehicle Slow: Considering that we can travel at mach 2, under 30mph should be considered slow.

Non-Human Slow: Considering that a peregrine falcon can travel at 120mph, under 30mph should be considered slow.

Human Slow: Considering that we walk at an average of 6mph, under 4mph should be considered slow. Yeah I agree with that.