Would love to know if others have a similar experience as me with 1.8.
GPU consumption decreased considerably for me since build 610, I can feel 1.8 far more responsive and optimized, the higher GPU usage I have noticed is around 15%:
Yes, I have. 
My CPU Utilization is still problematic.
Running Roon with Tidal on a Mac Mini (Catalina) and after having it running but hardly used by Mac Mini was running hot, when I checked activity Monitor the Roon was using 200% of my CPU.
Iâve got appalling GPU/CPU use on my M1 Mac using it as a Remote. Battery is getting hammered, with GPU constantly sitting at 20% or thereabouts and CPU at 35%.
What is it doing?
That is generally considered ânormalâ. Whether you think itâs high, is a different matter of course 
Users have been seeing up to 80% usage (including me).
CPU use of 35% when itâs just sitting there in the background playing an album is not normal though, by any stretch.
Unless Iâm mining Bitcoins for Danny.
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Honestly, 35% usage of a (single) core is something I consider not high. If youâre playing music that is. It would depend on what audio youâre playing, how many endpoints you have, what your dsp settings look like, any upsamping/downsampling involved, etc.
My VPN is now using 40% as we speak. My browser is using 25% as Iâm typing this message. So 35% for playing music doesnât seem all that high in this context.
What has that got anything to do with a Remote?
You might get apps that spike here and there. Regardless, itâs entirely irrelevant to the behaviour on display here.
My bad. I overlooked the part in your post talking about your M1 as a remote.
Maybe you are, we might all do it for our sw sellers.