Anybody gone from ethernet to optical for connection to a streamer?

Yes, optical is a big improvement. Can't say enough good stuff about the Sonore opticalRendu fed from a NAS device in another room. A good power supply for your renderer is also very important to allowing you to hear everything your optical changes will bring. 
Tons of threads on these topics here and on audiophilelifestyle. It's worth doing plenty of research to get a handle on it. Cheers,
Spencer

My player has an optical network input, so does getting sonore rendu thingy make sense?

jumia
My best advice to you is to keep it simple. I have been down this rabbit hole, switches, filters, clocks ect. You can spend thousands but no matter what you do it's only going to be so good your at the mercy of the people sending you the stream. These devices can change the sound slightly but is it for the better?

I'm back to the basics and the SQ is the best it has ever been. Ethernet cable from router to server, server to DAC Shunyata USB Omega cable.

Junia
Only way you're going to know is by trying, the great thing about streaming is the wide variety of equipment and constant innovation.

I will buy a dog.  Train it to bark alot.  Use my speakers for target practice.