Slow speaker cables?

I think you are referring to the decay of the sound. The room design also plays a role so different frequencies can decay differently. It's hard to tell if the speaker cables can affect the "speed" of various frequencies differently, like you said this is in the order of milliseconds, before sound production. Yet cables, just like all other components, do have the fast and slow characteristics.

I just looked up Chuck's comment on our ability to perceive sound in terms of speed, I found an excerpt that might be helpful ...

Human auditory perception has its limits as well – the minimum time in between sonic events to be distinguished separately is on the order of 20 milliseconds. Inside this limit, sounds begin to blur together to create first a buzzing then a continuum. Although this may be the limit to distinguishing sounds as separate events, human hearing is extremely sensitive to timing quality of events spaces in time. Percussionists create musical sonic events that are distinct, typically separated by hundreds of milliseconds. The accuracy with which they articulate any given event, however, is on the order of a millisecond.