Slow speaker cables?

"Wouldn't a slower cable slow all parts of signal down, not just one part?"

In a nutshell, probably not. Signal propagation of all sorts, including that associated with a wire conducting an electrical signals, is highly frequency dependent in theory. It's just a matter of how much and whether significant enough to matter or not in any particular case. I believe it is significant enough to matter for many with discerning ears in the case of speaker cables. Even more so in the case of analog ICs. At least, that is my assessment based on my personal listening experiences.

There is such a thing as the high end audio "twilight zone".

THings that are observed (or heard) to occur there cannot often be fully explained or quantified.

But they often do seem to really exist!

Its where tweaks like wire changes can be heard by many but predicting what one will actually hear in any particular case is often futile, as is expecting that another will hear exactly the same thing and react similarly.

All sorts of creatures, both dark and light inhabit the high end audio twilight zone. You have to identify the ones you can trust and the ones you cannot!

Eerie music plays......