Are all R2R dacs slow and soft?

@danmar123 good question. 
I can answer based on my experience -

when I added that trendnet switch I did it because I wanted to split the output of my router/mesh node into two branches - one that would feed the streaming card in my DAC and one that would feed my Roon Nucleus One. I was hoping that the trendnet will not degrade the sound quality because my older D-Link switch made the sound quality considerably worse. 
What I got with the Trendnet was actually a surprising benefit - quieter background, smoother sonics and improved tone. 
So in OP’s setup, if he hears positive impact from the configuration I recommended he can just get better Ethernet cables and feed both the AirLens and his SGC server a cleaner signal for even more improvement. 

In the hybrid dac I have it is not I have 8 BURR BROWN  CONVERTERS THAT 

ROUGHLY 30% is R2R THE REST DELTA SIGMA ,WITH MOSFETS 

MERASON DAC1 MK 2 is a great dac and under $10k. A true Best Buy 

and has great fast tuneful Bass, as well as a warmer very natural sound that is fast as the music is in real life !!

A well-designed R-2R DAC can be both very fast and very natural sounding. The resistor-ladder switching is extremely fast, enabling spontaneous transient attack and excellent micro-dynamic expression. My Micro DAC is just as fast as any delta-sigma DAC I’ve heard, while sounding more natural overall.

In contrast, the digital filters used in many delta-sigma DACs can sharpen the leading edge of notes, which may give the impression of greater speed but can also sound more artificial. With R-2R DACs—especially when NOS mode is engaged—the leading edge is slightly softened, allowing for more natural decay. This presentation may be perceived as slower, but it is often closer to how real instruments behave.

Your Cinnamon cable is not "defective" - but, it is being used for a purpose for which it was not designed.

It seems to me that a fundamental weakness in I2S is that DACs seem to be affected by everything before them.  With a good isolated asynchronous USB you are insulated from anything before it - the words are buffered and are read out by the DAC's clock.

@audphile1 

Thanks for your answer. I’m pretty new to midfi streaming, so that’s why I asked that question. My router is in the basement & I ran an ethernet cable upstairs to my system. My other choice would to relocate my router upstairs & port my comp. & printer in the basement. Reason for my question. My wifi is so strong right now, but looking to get an Aurender N-200 to go into my Aero DAC that’s being built as we speak. So they have to be hard wired. (no wifi card)