Ethernet tweaks is overlooked to improve sound if streaming audio imo. Theres audiophile switches and ethernet filters and better ethernet cables.I would only say it's worth the effort if everything else in your chain is already at the level where it can't offer any improvement. I'm talking relatively little stuff like cables, power conditioning, modest vibration control, negative ion generator, the works (I might be kidding on some of those but you get the idea).
I bought 2 ifi ipower x and replaced the standard power supplys for tp link ax 50 router and netgear gs108 switch. At first day listening i did not hear any difference but one week later i noticed my system have never sounded this good before. So maybe there was som hours burn in time.
From streamer to Lake People RS02 amp
Fatest bass i have heard. Now HD800S is bass king maybe not with sub bass because hp limitation but with mid bass. More warmer smoother bass with more air its like its leaving the hp and hoover more around and more articulate.
Treble harden up less and sound more sofisticated and detailed less sibilance more articulate.
Less glare and grain in voices.
Overall a cleaner warmer open airier sound. details is easier to hear. Probebly more dynamic also because sound dont collapse harden up as much at both ends, mute bass and treble information . I dont suspect placebo.
Even my Apple TV 4k got cleaner/sharper picture with my oled tv and with same sound improvements.
iFi audio has said its system dependent though if you will hear an improvement. Maybe if you have gear that clean up things very well allready but i think you will here an improvement anyway.