In message 
          The Natural Philosopher  wrote:

> On 23/06/2020 22:22, David Higton wrote:
> > In message 
> >            Michael J. Mahon  wrote:
> >
> > > More likely, capacitance between lines of a longer cable slows signal
> > > transitions, eroding signal margins.
> >
> > Please, learn transmission line theory.
> >
> > David
> >
> Is there any evidence that a USB cable behaves as a transmission line?

All cables behave as transmission lines.  So do PCB traces.

There are some situations where it isn't necessary to treat them as
such, but USB isn't one of them.

David

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