They concentrate on the sound - that's all they're keyed into. Statistical trends over time suggest that we are, as a species, approaching asymptotically a true maximum speed. Especially in the basic, ancient races between runner and runner, swimmer and swimmer, we may simply be closing in on an absolute limit to the speed that can be drawn in a big and well-trained world from the combination of muscle strength, preparation and technique. If nothing else, we can no longer tell winners from losers without the aid of a very good clock. Between thoughts, there are gaps - very, very short gaps.
Measurable breaks separate the songs on record albums.
Some are longer than others. That is usually deliberate. A sensitive record producer will run songs almost together or leave a perceptible pause, depending on the desired effect. Someone, though, must have realised that these gaps are a waste of time, in the same peculiar sense as the momentary fadeouts between segments of television programming. Certainly a second is long enough for impatience to begin welling up.