More detail about how to design products to mitigate these issues in a paper by Texas Instruments. Note the date of the original paper - 2008. Clearly some people have known about the real factors influencing ethernet cable performance for years...
TI Paper
TI Paper
IMac macOS 10.15.3 (no link to Devialet ) / MacBook Pro Retina OS X 10.14.4 / Linn LP12 / Devialet 200 / Wilson Benesch Discovery.
Qobuz Desktop Latest Version / Audirvana 3.2.18 / Audirvana Remote / iTunes 12.9 / AIR 3.0.4 / Wi-Fi / FW 8.1.0 / SAM 50%
Cambridge, UK (Updated 27th February, 2020)